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CVE-2026-34520

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3b11510d13cbf4030c11f0dc3109f7c9e57a60764e9d5906086edeed7ca7c6b3
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","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.7,"baseSeverity":"LOW","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:L/VA:N/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/adp/0/metrics/0/cvssV3_1

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:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.7,"baseSeverity":"LOW","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:L/VA:N/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-113","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /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:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /containers/cna/references/2
{"name":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a134ff608568685a1cba0107ea905fedaf981716d6f97b29f542f0d8c1a2f22b · sha256:7bd7d363ff3c5665… · /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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