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CVE-2026-59248

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server (or client) and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cow_hpack_common:dec_big_int/3 in src/cow_hpack_common.hrl (invoked from cow_hpack:decode/2 in src/cow_hpack.erl and from cow_qpack:decode_field_section/3 in src/cow_qpack.erl) reads continuation octets until it sees one whose high bit is c
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1891c6c129854c7229e2720d1fe80492f3c03fe215fab5f53bfc04c2806623ec
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:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_hpack","cow_qpack"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_hpack_common.hrl","src/cow_hpack.erl","src/cow_qpack.erl"],"programRoutines":[{"name":"cow_hpack:decode/2"},{"name":"cow_qpack:decode_field_section/3"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.19.0","status":"affected","version":"2.0.0-pre.1","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_hpack","cow_qpack"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_hpack_common.hrl","src/cow_hpack.erl","src/cow_qpack.erl"],"programRoutines":[{"name":"cow_hpack:decode/2"},{"name":"cow_qpack:decode_field_section/3"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"f582430498072a0c65ad338030321576dc13a343","status":"affected","version":"5ddecb…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_hpack","cow_qpack"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_hpack_common.hrl","src/cow_hpack.erl","src/cow_qpack.erl"],"programRoutines":[{"name":"cow_hpack:decode/2"},{"name":"cow_qpack:decode_field_section/3"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.19.0","status":"affected","version":"2.0.0-pre.1","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_hpack","cow_qpack"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_hpack_common.hrl","src/cow_hpack.erl","src/cow_qpack.erl"],"programRoutines":[{"name":"cow_hpack:decode/2"},{"name":"cow_qpack:decode_field_section/3"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"f582430498072a0c65ad338030321576dc13a343","status":"affected","version":"5ddecb…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /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:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["third-party-advisory","related"],"url":"https://cna.erlef.org/cves/CVE-2026-59248.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/cowlib/commit/f582430498072a0c65ad338030321576dc13a343"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-59248"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fb6eaac4431c703a9d7706253450a2088976656e34f46450e49019da6b2ca998 · sha256:3b4979d0fd99af8b… · /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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