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CVE-2026-34516

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. This issue has been patched in version 3.13.4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c6c220de243ee67a3416daacd29e6805b4b22d07dd17e43ab333cd630e041776
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/adp/0/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.6,"baseSeverity":"MEDIUM","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/E:U","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"product":"aiohttp","vendor":"aio-libs","versions":[{"status":"affected","version":"< 3.13.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/adp/0/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.6,"baseSeverity":"MEDIUM","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/E:U","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /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:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/references/1
{"name":"https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/references/2
{"name":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647","tags":["x_refsource_CONFIRM"],"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:01f1d330f0a6d802f72698faa25de05cd510918aa4b8b7ca83aea2b3fe21f593 · sha256:1e9ab49075710f64… · /containers/cna/references/0

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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