407 lines
23 KiB
JSON
407 lines
23 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97200",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-10-26T05:15:01.465Z",
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"datePublished": "2026-10-26T13:49:40.392Z",
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"dateUpdated": "2026-10-26T15:35:50.487Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"hackney_conn",
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"hackney"
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],
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"packageName": "hackney",
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"packageURL": "pkg:hex/hackney",
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"product": "hackney",
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"programFiles": [
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"src/hackney_conn.erl",
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"src/hackney.erl"
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],
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"programRoutines": [
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{
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"name": "hackney_conn:read_full_body/2"
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},
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{
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"name": "hackney_conn:maybe_decompress_body/2"
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},
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{
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"name": "hackney_conn:decompress_gzip/1"
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},
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{
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"name": "hackney_conn:decompress_deflate/1"
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},
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{
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"name": "hackney:request/5"
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},
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{
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"name": "hackney:body/1"
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}
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],
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"repo": "https://github.com/benoitc/hackney",
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"vendor": "benoitc",
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"versions": [
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{
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"lessThan": "4.9.0",
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"status": "affected",
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"version": "2.0.0-beta.1",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"hackney_conn",
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"hackney"
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],
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"packageName": "benoitc/hackney",
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"packageURL": "pkg:github/benoitc/hackney",
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"product": "hackney",
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"programFiles": [
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"src/hackney_conn.erl",
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"src/hackney.erl"
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],
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"programRoutines": [
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{
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"name": "hackney_conn:read_full_body/2"
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},
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{
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"name": "hackney_conn:maybe_decompress_body/2"
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},
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{
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"name": "hackney_conn:decompress_gzip/1"
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},
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{
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"name": "hackney_conn:decompress_deflate/1"
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},
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{
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"name": "hackney:request/5"
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},
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{
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"name": "hackney:body/1"
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}
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],
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"repo": "https://github.com/benoitc/hackney",
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"vendor": "benoitc",
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"versions": [
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{
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"lessThan": "493e8bf83a391548e5101792276ab3fc428fa76c",
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"status": "affected",
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"version": "dc41b79339ca0c41e16d3f2dd17172bc2de855d6",
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"versionType": "git"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "4.9.0",
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"versionStartIncluding": "2.0.0-beta.1",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Martin Karrer"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "Quinn Wilton"
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},
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{
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"lang": "en",
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"type": "reporter",
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"value": "Quinn Wilton"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Martin Karrer"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Benoit Chesneau"
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},
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{
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"lang": "en",
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"type": "coordinator",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"dateAssigned": "2026-10-26T09:42:31.000Z",
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"datePublic": "2026-10-25T00:00:00.000Z",
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in <code>hackney_conn</code> in benoitc hackney allows a malicious HTTP server to exhaust client memory via an oversized or highly compressed response body. <code>hackney:request/5</code> and <code>hackney:body/1</code> return the whole response body, and nothing bounds how much the connection process buffers. Any server the client requests can trigger it.</p>\n<p><code>hackney_conn:read_full_body/2</code> and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With <code>{auto_decompress, true}</code> the buffered body is then inflated in one step with <code>zlib:gunzip/1</code> or <code>zlib:inflate/2</code>, which return the whole output at once.</p>\n<p>This issue affects hackney: from 2.0.0-beta.1 before 4.9.0.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in `hackney_conn` in benoitc hackney allows a malicious HTTP server to exhaust client memory via an oversized or highly compressed response body. `hackney:request/5` and `hackney:body/1` return the whole response body, and nothing bounds how much the connection process buffers. Any server the client requests can trigger it.\n\n`hackney_conn:read_full_body/2` and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With `{auto_decompress, true}` the buffered body is then inflated in one step with `zlib:gunzip/1` or `zlib:inflate/2`, which return the whole output at once.\n\nThis issue affects hackney: from 2.0.0-beta.1 before 4.9.0."
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in hackney_conn in benoitc hackney allows a malicious HTTP server to exhaust client memory via an oversized or highly compressed response body. hackney:request/5 and hackney:body/1 return the whole response body, and nothing bounds how much the connection process buffers. Any server the client requests can trigger it.\n\nhackney_conn:read_full_body/2 and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With {auto_decompress, true} the buffered body is then inflated in one step with zlib:gunzip/1 or zlib:inflate/2, which return the whole output at once.\n\nThis issue affects hackney: from 2.0.0-beta.1 before 4.9.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>A server the client requests can make the client allocate memory proportional to the body it sends, or to its decompressed size, until the node runs out of memory.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "A server the client requests can make the client allocate memory proportional to the body it sends, or to its decompressed size, until the node runs out of memory."
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}
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],
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"value": "A server the client requests can make the client allocate memory proportional to the body it sends, or to its decompressed size, until the node runs out of memory."
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 8.2,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-409",
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"description": "CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)",
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"lang": "en",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-770",
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-10-26T13:49:40.392Z"
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},
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"references": [
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{
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"name": "hackney 4.9.0 release notes",
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/benoitc/hackney/releases/tag/4.9.0"
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},
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{
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"name": "EEF CNA record for CVE-2026-97200",
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-97200.html"
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},
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{
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"name": "OSV record EEF-CVE-2026-97200",
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-97200"
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},
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{
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"name": "Cap buffered response bodies with max_body_size and bound decompression (benoitc/hackney#980)",
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"tags": [
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"related"
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],
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"url": "https://github.com/benoitc/hackney/pull/980"
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},
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{
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"name": "Introducing commit dc41b79 in benoitc/hackney",
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"tags": [
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"related"
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],
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"url": "https://github.com/benoitc/hackney/commit/dc41b79339ca0c41e16d3f2dd17172bc2de855d6"
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},
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{
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"name": "Fix commit 493e8bf in benoitc/hackney",
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"tags": [
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"patch"
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],
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"url": "https://github.com/benoitc/hackney/commit/493e8bf83a391548e5101792276ab3fc428fa76c"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Unbounded response body buffering and decompression in hackney",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Leave <code>auto_decompress</code> disabled (the default). Without it <code>hackney_conn:maybe_decompress_body/2</code> never inflates the body, which closes the amplification half. The uncapped raw body read has no workaround.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Leave `auto_decompress` disabled (the default). Without it `hackney_conn:maybe_decompress_body/2` never inflates the body, which closes the amplification half. The uncapped raw body read has no workaround."
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}
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],
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"value": "Leave auto_decompress disabled (the default). Without it hackney_conn:maybe_decompress_body/2 never inflates the body, which closes the amplification half. The uncapped raw body read has no workaround."
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}
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],
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"x_proofOfConcept": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<ol>\n<li>Build a gzip stream whose inflated size is 1 GB from a reused 64 KB chunk of zero bytes (deflate with window bits 31, best compression). The stream is about 1 MB on the wire.</li>\n<li>Start a TCP listener on loopback that accepts one connection, reads the request, and answers <code>HTTP/1.1 200 OK</code> with <code>Content-Encoding: gzip</code>, a <code>Content-Length</code> matching the stream, <code>Connection: close</code>, and the stream as body.</li>\n<li>From a node running a vulnerable hackney, call <code>hackney:request(get, Url, [], <<>>, [{auto_decompress, true}, with_body])</code> against that listener.</li>\n<li>Observe the returned body of 1,048,576,000 bytes and the VM memory growing by about 1.8 GB for a 1,019,197 byte response. A larger stream, or an endless body without <code>auto_decompress</code>, drives the node out of memory.</li>\n</ol>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "1. Build a gzip stream whose inflated size is 1 GB from a reused 64 KB chunk of zero bytes (deflate with window bits 31, best compression). The stream is about 1 MB on the wire.\n2. Start a TCP listener on loopback that accepts one connection, reads the request, and answers `HTTP/1.1 200 OK` with `Content-Encoding: gzip`, a `Content-Length` matching the stream, `Connection: close`, and the stream as body.\n3. From a node running a vulnerable hackney, call `hackney:request(get, Url, [], <<>>, [{auto_decompress, true}, with_body])` against that listener.\n4. Observe the returned body of 1,048,576,000 bytes and the VM memory growing by about 1.8 GB for a 1,019,197 byte response. A larger stream, or an endless body without `auto_decompress`, drives the node out of memory."
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}
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],
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"value": "* Build a gzip stream whose inflated size is 1 GB from a reused 64 KB chunk of zero bytes (deflate with window bits 31, best compression). The stream is about 1 MB on the wire.\n* Start a TCP listener on loopback that accepts one connection, reads the request, and answers HTTP/1.1 200 OK with Content-Encoding: gzip, a Content-Length matching the stream, Connection: close, and the stream as body.\n* From a node running a vulnerable hackney, call hackney:request(get, Url, [], <<>>, [{auto_decompress, true}, with_body]) against that listener.\n* Observe the returned body of 1,048,576,000 bytes and the VM memory growing by about 1.8 GB for a 1,019,197 byte response. A larger stream, or an endless body without auto_decompress, drives the node out of memory."
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}
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],
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"x_technicalAnalysis": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p><strong>1. Unbounded accumulation.</strong> <code>hackney:request/5</code> with a body, and <code>hackney:body/1</code> after <code>start_response/1</code>, read the response in <code>src/hackney_conn.erl</code> through <code>read_full_body/2</code>, which appends each chunk to a binary accumulator until the body ends. The HTTP/2 and HTTP/3 synchronous paths accumulate stream data the same way. No option caps the size.</p>\n<p><strong>2. One-step decompression.</strong> With <code>{auto_decompress, true}</code> hackney sends <code>Accept-Encoding: gzip, deflate</code>. Once the body is complete, <code>maybe_decompress_body/2</code> dispatches on <code>Content-Encoding</code> to <code>decompress_gzip/1</code> (<code>zlib:gunzip/1</code>) or <code>decompress_deflate/1</code> (<code>zlib:inflate/2</code>). Both return the whole output at once, so the inflated size is bounded only by the compression ratio. The report measured a 1 MB gzip body inflating to 1 GB on hackney 4.8.4.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "**1. Unbounded accumulation.** `hackney:request/5` with a body, and `hackney:body/1` after `start_response/1`, read the response in `src/hackney_conn.erl` through `read_full_body/2`, which appends each chunk to a binary accumulator until the body ends. The HTTP/2 and HTTP/3 synchronous paths accumulate stream data the same way. No option caps the size.\n\n**2. One-step decompression.** With `{auto_decompress, true}` hackney sends `Accept-Encoding: gzip, deflate`. Once the body is complete, `maybe_decompress_body/2` dispatches on `Content-Encoding` to `decompress_gzip/1` (`zlib:gunzip/1`) or `decompress_deflate/1` (`zlib:inflate/2`). Both return the whole output at once, so the inflated size is bounded only by the compression ratio. The report measured a 1 MB gzip body inflating to 1 GB on hackney 4.8.4."
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}
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],
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"value": "1. Unbounded accumulation. hackney:request/5 with a body, and hackney:body/1 after start_response/1, read the response in src/hackney_conn.erl through read_full_body/2, which appends each chunk to a binary accumulator until the body ends. The HTTP/2 and HTTP/3 synchronous paths accumulate stream data the same way. No option caps the size.\n\n2. One-step decompression. With {auto_decompress, true} hackney sends Accept-Encoding: gzip, deflate. Once the body is complete, maybe_decompress_body/2 dispatches on Content-Encoding to decompress_gzip/1 (zlib:gunzip/1) or decompress_deflate/1 (zlib:inflate/2). Both return the whole output at once, so the inflated size is bounded only by the compression ratio. The report measured a 1 MB gzip body inflating to 1 GB on hackney 4.8.4."
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}
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]
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-97200",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-26T14:54:57.385457Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-26T15:35:50.487Z"
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}
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|
}
|
|
]
|
|
}
|
|
} |