318 lines
19 KiB
JSON
318 lines
19 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-2026-111101",
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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": "2026-10-23T12:30:01.834Z",
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"datePublished": "2026-10-26T13:31:48.184Z",
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"dateUpdated": "2026-10-26T15:35:51.401Z"
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"packageName": "bandit",
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"packageURL": "pkg:hex/bandit",
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"product": "bandit",
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "1.14.0",
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"packageName": "mtrudel/bandit",
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"packageURL": "pkg:github/mtrudel/bandit",
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"product": "bandit",
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "220b9dfd27f9a21305be2afc75cbe585ddc24e7a",
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"status": "affected",
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"version": "7201270c34b90f6c9e15c0386c2bb802c0c72ab4",
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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:mtrudel:bandit:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.14.0",
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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": "reporter",
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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": "Mat Trudel"
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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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"dateAssigned": "2026-10-23T12:35:54.000Z",
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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 the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory and CPU via a request body made of many 1-byte chunks.</p>\n<p>The chunked reader in <code>lib/bandit/http1/socket.ex</code> keeps every chunk as its own list cell and binary term until <code>IO.iodata_to_binary/1</code> joins them, and nothing limits the number of chunks. The <code>:length</code> option of <code>read_body/2</code> counts only data bytes, so tiny chunks cost far more memory than their payload: 48 MB of 1-byte chunks grew one handler process to about 500 MB and took about 6 s of CPU. The route does not need to read the body, because on keep-alive connections <code>ensure_completed/1</code> drains unread bodies through the same reader.</p>\n<p>This issue affects bandit: from 0.1.0 before 1.14.0.</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 the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory and CPU via a request body made of many 1-byte chunks.\n\nThe chunked reader in `lib/bandit/http1/socket.ex` keeps every chunk as its own list cell and binary term until `IO.iodata_to_binary/1` joins them, and nothing limits the number of chunks. The `:length` option of `read_body/2` counts only data bytes, so tiny chunks cost far more memory than their payload: 48 MB of 1-byte chunks grew one handler process to about 500 MB and took about 6 s of CPU. The route does not need to read the body, because on keep-alive connections `ensure_completed/1` drains unread bodies through the same reader.\n\nThis issue affects bandit: from 0.1.0 before 1.14.0."
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory and CPU via a request body made of many 1-byte chunks.\n\nThe chunked reader in lib/bandit/http1/socket.ex keeps every chunk as its own list cell and binary term until IO.iodata_to_binary/1 joins them, and nothing limits the number of chunks. The :length option of read_body/2 counts only data bytes, so tiny chunks cost far more memory than their payload: 48 MB of 1-byte chunks grew one handler process to about 500 MB and took about 6 s of CPU. The route does not need to read the body, because on keep-alive connections ensure_completed/1 drains unread bodies through the same reader.\n\nThis issue affects bandit: from 0.1.0 before 1.14.0."
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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>An unauthenticated client can make a single HTTP/1.1 request hold many times its body size in server memory (about 48 MB for a 1 MB body in the reporter's test), and keep CPU busy while the chunks are joined. This affects any Bandit server that accepts HTTP/1.1 requests, whether or not its routes read the body.</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": "An unauthenticated client can make a single HTTP/1.1 request hold many times its body size in server memory (about 48 MB for a 1 MB body in the reporter's test), and keep CPU busy while the chunks are joined. This affects any Bandit server that accepts HTTP/1.1 requests, whether or not its routes read the body."
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}
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],
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"value": "An unauthenticated client can make a single HTTP/1.1 request hold many times its body size in server memory (about 48 MB for a 1 MB body in the reporter's test), and keep CPU busy while the chunks are joined. This affects any Bandit server that accepts HTTP/1.1 requests, whether or not its routes read the body."
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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": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 8.7,
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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:N/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-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": "2026-10-26T13:31:48.184Z"
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},
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"references": [
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{
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"name": "HTTP/1.1 chunked request bodies made of 1-byte chunks amplify memory use in Bandit",
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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/mtrudel/bandit/security/advisories/GHSA-jwh3-j29h-qfmw"
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},
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{
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"name": "EEF CNA record for CVE-2026-111101",
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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-2026-111101.html"
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},
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{
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"name": "OSV record EEF-CVE-2026-111101",
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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-2026-111101"
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},
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{
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"name": "Introducing commit 7201270 in mtrudel/bandit",
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"tags": [
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"related"
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],
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"url": "https://github.com/mtrudel/bandit/commit/7201270c34b90f6c9e15c0386c2bb802c0c72ab4"
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},
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{
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"name": "Fix commit 220b9df in mtrudel/bandit",
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"tags": [
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"patch"
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],
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"url": "https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"
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}
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],
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"source": {
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"discovery": "UNKNOWN"
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},
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"title": "HTTP/1.1 chunked request bodies made of 1-byte chunks amplify memory use in Bandit",
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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>From 0.7.0, a server whose clients and proxies all speak HTTP/2 can disable HTTP/1 with <code>http_1_options: [enabled: false]</code>, so that the vulnerable chunked body reader never runs.</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": "From 0.7.0, a server whose clients and proxies all speak HTTP/2 can disable HTTP/1 with `http_1_options: [enabled: false]`, so that the vulnerable chunked body reader never runs."
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}
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],
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"value": "From 0.7.0, a server whose clients and proxies all speak HTTP/2 can disable HTTP/1 with http_1_options: [enabled: false], so that the vulnerable chunked body reader never runs."
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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>Run Bandit with a Plug that calls <code>Plug.Conn.read_body(conn, length: 1_000_000, read_length: 1_000_000)</code>.</li>\n<li>Send <code>POST /</code> with <code>Transfer-Encoding: chunked</code> and a body of 1,000,000 chunks of <code>1\\r\\nA\\r\\n</code>, followed by <code>0\\r\\n\\r\\n</code>.</li>\n<li>When <code>read_body</code> returns the 1,000,000 body bytes, the handler process holds about 48 MB and BEAM memory has grown by about 55 MB, for 6 MB sent.</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. Run Bandit with a Plug that calls `Plug.Conn.read_body(conn, length: 1_000_000, read_length: 1_000_000)`.\n2. Send `POST /` with `Transfer-Encoding: chunked` and a body of 1,000,000 chunks of `1\\r\\nA\\r\\n`, followed by `0\\r\\n\\r\\n`.\n3. When `read_body` returns the 1,000,000 body bytes, the handler process holds about 48 MB and BEAM memory has grown by about 55 MB, for 6 MB sent."
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}
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],
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"value": "* Run Bandit with a Plug that calls Plug.Conn.read_body(conn, length: 1_000_000, read_length: 1_000_000).\n* Send POST / with Transfer-Encoding: chunked and a body of 1,000,000 chunks of 1\\r\\nA\\r\\n, followed by 0\\r\\n\\r\\n.\n* When read_body returns the 1,000,000 body bytes, the handler process holds about 48 MB and BEAM memory has grown by about 55 MB, for 6 MB sent."
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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. Per-chunk accumulation.</strong> <code>do_read_chunked_data!</code> in <code>lib/bandit/http1/socket.ex</code> collects chunks as <code>[body | chunk]</code>, adding a cons cell and a binary term for every chunk.</p>\n<p><strong>2. Byte-only limit.</strong> <code>:length</code> limits data bytes, not the number of chunks, so a body of <code>1\\r\\nx\\r\\n</code> chunks becomes an 8-million-element improper list before <code>IO.iodata_to_binary</code> runs. Sending 48 MB of 1-byte chunks grew the handler heap to about 500 MB and used about 6 s of CPU. The same body as one 8 MB chunk peaked at about 16 MB and took 5 ms.</p>\n<p><strong>3. No body read needed.</strong> On keep-alive connections, <code>ensure_completed/1</code> drains unread bodies through the same path. Against a Plug that never calls <code>read_body</code>, the attack used about 417 MB.</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. Per-chunk accumulation.** `do_read_chunked_data!` in `lib/bandit/http1/socket.ex` collects chunks as `[body | chunk]`, adding a cons cell and a binary term for every chunk.\n\n**2. Byte-only limit.** `:length` limits data bytes, not the number of chunks, so a body of `1\\r\\nx\\r\\n` chunks becomes an 8-million-element improper list before `IO.iodata_to_binary` runs. Sending 48 MB of 1-byte chunks grew the handler heap to about 500 MB and used about 6 s of CPU. The same body as one 8 MB chunk peaked at about 16 MB and took 5 ms.\n\n**3. No body read needed.** On keep-alive connections, `ensure_completed/1` drains unread bodies through the same path. Against a Plug that never calls `read_body`, the attack used about 417 MB."
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}
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],
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"value": "1. Per-chunk accumulation. do_read_chunked_data! in lib/bandit/http1/socket.ex collects chunks as [body | chunk], adding a cons cell and a binary term for every chunk.\n\n2. Byte-only limit. :length limits data bytes, not the number of chunks, so a body of 1\\r\\nx\\r\\n chunks becomes an 8-million-element improper list before IO.iodata_to_binary runs. Sending 48 MB of 1-byte chunks grew the handler heap to about 500 MB and used about 6 s of CPU. The same body as one 8 MB chunk peaked at about 16 MB and took 5 ms.\n\n3. No body read needed. On keep-alive connections, ensure_completed/1 drains unread bodies through the same path. Against a Plug that never calls read_body, the attack used about 417 MB."
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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-2026-111101",
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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": "2026-10-26T15:10:33.224480Z"
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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": "2026-10-26T15:35:51.401Z"
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}
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}
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]
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}
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} |