281 lines
14 KiB
JSON
281 lines
14 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-2026-49755",
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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": "2026-06-01T13:45:22.448Z",
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"datePublished": "2026-06-08T15:20:57.415Z",
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"dateUpdated": "2026-06-08T17:14:08.858Z"
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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:wojtekmach:req:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Req.Steps'"
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],
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"packageName": "req",
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"packageURL": "pkg:hex/req",
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"product": "req",
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"programFiles": [
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"lib/req/steps.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Req.Steps':decode_body/1"
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},
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{
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"name": "'Elixir.Req.Steps':decompress_body/1"
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}
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],
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"repo": "https://github.com/wojtekmach/req",
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"vendor": "wojtekmach",
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"versions": [
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{
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"lessThan": "0.6.1",
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"status": "affected",
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"version": "0.1.0",
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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:wojtekmach:req:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Req.Steps'"
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],
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"packageName": "wojtekmach/req",
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"packageURL": "pkg:github/wojtekmach/req",
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"product": "req",
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"programFiles": [
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"lib/req/steps.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Req.Steps':decode_body/1"
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},
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{
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"name": "'Elixir.Req.Steps':decompress_body/1"
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}
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],
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"repo": "https://github.com/wojtekmach/req.git",
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"vendor": "wojtekmach",
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"versions": [
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{
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"lessThan": "84977e5b1a83f26e749d55ad06e3625464af4e8d",
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"status": "affected",
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"version": "e37753741cbdc725e6aba3d977b380163bfc0ecb",
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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:wojtekmach:req:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.6.1",
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"versionStartIncluding": "0.1.0",
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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": "Peter Ullrich"
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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": "Wojtek Mach"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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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": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies.<p>Req's default response pipeline includes <tt>'Elixir.Req.Steps':decode_body/1</tt> and <tt>'Elixir.Req.Steps':decompress_body/1</tt> in <tt>lib/req/steps.ex</tt>. <tt>decode_body/1</tt> dispatches on the server-supplied <tt>content-type</tt> (or URL extension) and calls <tt>:zip.extract(body, [:memory])</tt> for <tt>application/zip</tt>, <tt>:erl_tar.extract({:binary, body}, [:memory])</tt> for <tt>application/x-tar</tt>, and <tt>:erl_tar.extract({:binary, body}, [:memory, :compressed])</tt> for <tt>application/gzip</tt> / <tt>.tgz</tt>. Each returns the full decompressed archive contents as a <tt>[{name, bytes}]</tt> list in memory, with no per-entry or total size cap. <tt>decompress_body/1</tt> walks the <tt>content-encoding</tt> header and chains <tt>:zlib</tt>/<tt>:brotli</tt>/<tt>:ezstd</tt> decoders, so a response advertising <tt>content-encoding: gzip, gzip, gzip</tt> inflates through multiple layers without bound.</p><p>Both steps are enabled by default, no caller opt-in is required, and the attacker controls the <tt>content-type</tt> and <tt>content-encoding</tt> headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.</p><p>This issue affects req: from 0.1.0 before 0.6.1.</p>"
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}
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],
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"value": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies.\n\nReq's default response pipeline includes Req.Steps.decode_body/1 and Req.Steps.decompress_body/1 in lib/req/steps.ex. decode_body/1 dispatches on the server-supplied content-type (or URL extension) and calls :zip.extract(body, [:memory]) for application/zip, :erl_tar.extract({:binary, body}, [:memory]) for application/x-tar, and :erl_tar.extract({:binary, body}, [:memory, :compressed]) for application/gzip / .tgz. Each returns the full decompressed archive contents as a [{name, bytes}] list in memory, with no per-entry or total size cap. decompress_body/1 walks the content-encoding header and chains :zlib/:brotli/:ezstd decoders, so a response advertising content-encoding: gzip, gzip, gzip inflates through multiple layers without bound.\n\nBoth steps are enabled by default, no caller opt-in is required, and the attacker controls the content-type and content-encoding headers on their own server (or on any host reached via Req's automatic redirect following). A sub-megabyte response can expand to multiple gigabytes on the victim, crashing the BEAM process.\n\nThis issue affects req: from 0.1.0 before 0.6.1."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-197",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-197 Exponential Data Expansion"
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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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"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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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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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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},
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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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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-06-08T17:14:08.858Z"
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},
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"references": [
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{
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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/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"
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},
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{
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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-2026-49755.html"
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},
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{
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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-2026-49755"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/wojtekmach/req/commit/84977e5b1a83f26e749d55ad06e3625464af4e8d"
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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": "Decompression bomb DoS in Req via auto-decoded archive and compressed response bodies",
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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>Disable Req's automatic body decoding on requests that fetch attacker-influenced URLs by passing <tt>decode_body: false</tt> to <tt>'Elixir.Req':new/1</tt> / <tt>'Elixir.Req':get!/1</tt>. To also skip the <tt>content-encoding</tt> decompression pipeline, pass <tt>raw: true</tt>. Both options leave the response body as the raw on-the-wire bytes, so the caller can size-check before any decompression.</p>"
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}
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],
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"value": "Disable Req's automatic body decoding on requests that fetch attacker-influenced URLs by passing decode_body: false to Req.new/1 / Req.get!/1. To also skip the content-encoding decompression pipeline, pass raw: true. Both options leave the response body as the raw on-the-wire bytes, so the caller can size-check before any decompression."
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-06-08T16:49:57.977214Z",
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"id": "CVE-2026-49755",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-06-08T16:50:03.277Z"
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}
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}
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]
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}
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} |