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CVE-2026-65624

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1. The HTTP/1.1 handler in cowboy_http enforces the max_headers limit by counting the number of distinct header names in a map (maps:size(Headers)). When a request contains multiple header lines with the same name, the values are concatenated into a single ever-growing binary stored under that one map key (", " for regu
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d30e2289d58c29005e6e0d2cd60ffa802b90dbb9f5fe71a01095250b239c60ec
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_http"],"packageName":"cowboy","packageURL":"pkg:hex/cowboy","product":"cowboy","programFiles":["src/cowboy_http.erl"],"programRoutines":[{"name":"cowboy_http:parse_header/3"},{"name":"cowboy_http:parse_hd_value/6"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"2.18.0","status":"affected","version":"2.0.0-pre.4","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_http"],"packageName":"ninenines/cowboy","packageURL":"pkg:github/ninenines/cowboy","product":"cowboy","programFiles":["src/cowboy_http.erl"],"programRoutines":[{"name":"cowboy_http:parse_header/3"},{"name":"cowboy_http:parse_hd_value/6"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"3a34d8c1cfd94326466aa16a9017236691dc9c55","status":"affected","version":"309780a9fda145c262a47ac7811ffd50a0271c5b","versionType":"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_http"],"packageName":"cowboy","packageURL":"pkg:hex/cowboy","product":"cowboy","programFiles":["src/cowboy_http.erl"],"programRoutines":[{"name":"cowboy_http:parse_header/3"},{"name":"cowboy_http:parse_hd_value/6"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"2.18.0","status":"affected","version":"2.0.0-pre.4","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_http"],"packageName":"ninenines/cowboy","packageURL":"pkg:github/ninenines/cowboy","product":"cowboy","programFiles":["src/cowboy_http.erl"],"programRoutines":[{"name":"cowboy_http:parse_header/3"},{"name":"cowboy_http:parse_hd_value/6"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"3a34d8c1cfd94326466aa16a9017236691dc9c55","status":"affected","version":"309780a9fda145c262a47ac7811ffd50a0271c5b","versionType":"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["related","third-party-advisory"],"url":"https://cna.erlef.org/cves/CVE-2026-65624.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/cowboy/commit/3a34d8c1cfd94326466aa16a9017236691dc9c55"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-65624"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:57c43957f6c5b8704907fa50e032e6e5e703cf9959c07402c9eeb57713093c3c · sha256:b7eeb9e66e9e5f67… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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