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CVE-2026-8466

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows denial of service via unbounded buffer accumulation in multipart header parsing. cowboy_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 e
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d6852a7cfbb9f9360e06534adc6c47936e13f09f3224ef75812ed762996ca605
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://github.com","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_req"],"packageName":"ninenines/cowboy","packageURL":"pkg:github/ninenines/cowboy","product":"cowboy","programFiles":["src/cowboy_req.erl"],"programRoutines":[{"name":"cowboy_req:read_part/1"},{"name":"cowboy_req:read_part/2"},{"name":"cowboy_req:read_part/3"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"5c6a2061b41bb5771c4659fac7d5a822dca5bafb","status":"affected","version":"917cf99e10c41676183d501b86af6e47c95…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_req"],"packageName":"cowboy","packageURL":"pkg:hex/cowboy","product":"cowboy","programFiles":["src/cowboy_req.erl"],"programRoutines":[{"name":"cowboy_req:read_part/1"},{"name":"cowboy_req:read_part/2"},{"name":"cowboy_req:read_part/3"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"2.15.0","status":"affected","version":"2.0.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_req"],"packageName":"ninenines/cowboy","packageURL":"pkg:github/ninenines/cowboy","product":"cowboy","programFiles":["src/cowboy_req.erl"],"programRoutines":[{"name":"cowboy_req:read_part/1"},{"name":"cowboy_req:read_part/2"},{"name":"cowboy_req:read_part/3"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"5c6a2061b41bb5771c4659fac7d5a822dca5bafb","status":"affected","version":"917cf99e10c41676183d501b86af6e47c95…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cowboy_req"],"packageName":"cowboy","packageURL":"pkg:hex/cowboy","product":"cowboy","programFiles":["src/cowboy_req.erl"],"programRoutines":[{"name":"cowboy_req:read_part/1"},{"name":"cowboy_req:read_part/2"},{"name":"cowboy_req:read_part/3"}],"repo":"https://github.com/ninenines/cowboy","vendor":"ninenines","versions":[{"lessThan":"2.15.0","status":"affected","version":"2.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /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:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["related","third-party-advisory"],"url":"https://cna.erlef.org/cves/CVE-2026-8466.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/cowboy/commit/5c6a2061b41bb5771c4659fac7d5a822dca5bafb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-8466"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7eab1493dcf5b7cc4c69c18b8727338693330f9e3ef48686e5a76bbe7423522 · sha256:7304f3c69f81c897… · /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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