AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
PYSEC-2026-3545 · CVE-2026-69244 · GHSA-cq5v-8q36-5273
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Description
Summary
An out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response.
Impact
An attacker controlled server, or possibly an accidental response could trigger a DoS in the client.
Workaround
If unable to upgrade, the Python parser is unaffected and can be used with AIOHTTP_NO_EXTENSIONS=1.
Patch: https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d
References
- WEB https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273
- WEB https://github.com/aio-libs/aiohttp/pull/13223
- WEB https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d
- PACKAGE https://github.com/aio-libs/aiohttp
- WEB https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3
- PACKAGE https://pypi.org/project/aiohttp
- ADVISORY https://github.com/advisories/GHSA-cq5v-8q36-5273
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-69244
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