267 lines
12 KiB
JSON
267 lines
12 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-2026-8466",
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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": "2026-05-13T11:44:39.149Z",
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"datePublished": "2026-05-13T18:26:21.089Z",
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"dateUpdated": "2026-05-14T04:30:32.552Z"
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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:ninenines:cowboy:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"cowboy_req"
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],
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"packageName": "cowboy",
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"packageURL": "pkg:hex/cowboy",
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"product": "cowboy",
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"programFiles": [
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"src/cowboy_req.erl"
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],
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"programRoutines": [
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{
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"name": "cowboy_req:read_part/1"
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},
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{
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"name": "cowboy_req:read_part/2"
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},
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{
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"name": "cowboy_req:read_part/3"
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}
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],
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"repo": "https://github.com/ninenines/cowboy",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "2.15.0",
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"status": "affected",
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"version": "2.0.0",
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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:ninenines:cowboy:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"cowboy_req"
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],
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"packageName": "ninenines/cowboy",
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"packageURL": "pkg:github/ninenines/cowboy",
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"product": "cowboy",
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"programFiles": [
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"src/cowboy_req.erl"
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],
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"programRoutines": [
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{
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"name": "cowboy_req:read_part/1"
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},
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{
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"name": "cowboy_req:read_part/2"
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},
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{
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"name": "cowboy_req:read_part/3"
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}
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],
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"repo": "https://github.com/ninenines/cowboy",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "5c6a2061b41bb5771c4659fac7d5a822dca5bafb",
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"status": "affected",
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"version": "917cf99e10c41676183d501b86af6e47c95afb89",
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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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"configurations": [
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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>The application must expose an HTTP endpoint that calls <tt>cowboy_req:read_part/1,2</tt> to process <tt>multipart/form-data</tt> request bodies. Deployments that do not handle multipart uploads are not affected.</p>"
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}
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],
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"value": "The application must expose an HTTP endpoint that calls cowboy_req:read_part/1,2 to process multipart/form-data request bodies. Deployments that do not handle multipart uploads are not affected."
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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:ninenines:cowboy:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "2.15.0",
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"versionStartIncluding": "2.0.0",
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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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}
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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": "Loïc Hoguin"
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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": "<p>Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows denial of service via unbounded buffer accumulation in multipart header parsing.</p><p><tt>cowboy_req:read_part/3</tt> in <tt>src/cowboy_req.erl</tt> accumulates incoming request bytes into a <tt>Buffer</tt> binary with no upper-bound check. When <tt>cow_multipart:parse_headers/2</tt> returns <tt>more</tt> or <tt>{more, Buffer2}</tt>, the function reads up to <tt>Length</tt> bytes (default 64 KB) from the request body and recurses with the enlarged buffer. There is no equivalent of the <tt>byte_size(Acc) > Length</tt> guard present in the sibling function <tt>read_part_body/4</tt>. An unauthenticated attacker can send a <tt>multipart/form-data</tt> request whose body never yields a complete header section — for example, a body that never contains the advertised boundary delimiter, or one whose header lines never contain <tt>\\r\\n\\r\\n</tt> — and force the server process to accumulate memory linearly with the bytes the protocol layer is willing to deliver. A handful of concurrent such uploads is sufficient to exhaust BEAM memory.</p><p>This issue affects cowboy from 2.0.0 before 2.15.0.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows denial of service via unbounded buffer accumulation in multipart header parsing.\n\ncowboy_req:read_part/3 in src/cowboy_req.erl accumulates incoming request bytes into a Buffer binary with no upper-bound check. When cow_multipart:parse_headers/2 returns more or {more, Buffer2}, the function reads up to Length bytes (default 64 KB) from the request body and recurses with the enlarged buffer. There is no equivalent of the byte_size(Acc) > Length guard present in the sibling function read_part_body/4. An unauthenticated attacker can send a multipart/form-data request whose body never yields a complete header section — for example, a body that never contains the advertised boundary delimiter, or one whose header lines never contain \\r\\n\\r\\n — and force the server process to accumulate memory linearly with the bytes the protocol layer is willing to deliver. A handful of concurrent such uploads is sufficient to exhaust BEAM memory.\n\nThis issue affects cowboy from 2.0.0 before 2.15.0."
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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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"value": "CAPEC-130 Excessive Allocation"
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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-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": "2026-05-14T04:30:32.552Z"
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},
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"references": [
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{
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"tags": [
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"related",
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"third-party-advisory"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-8466.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-2026-8466"
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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/ninenines/cowboy/commit/5c6a2061b41bb5771c4659fac7d5a822dca5bafb"
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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 buffer accumulation in multipart header parsing causes denial of service in cowboy",
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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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"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": "2026-05-13T18:46:37.406887Z",
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"id": "CVE-2026-8466",
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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": "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": "2026-05-13T18:52:29.452Z"
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}
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}
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]
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}
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} |