PYSEC-2026-3545
AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
At a glance
- Published
- Updated
- CVE
- CVE-2026-69244
- Aliases
- GHSA-cq5v-8q36-5273
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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
Affected packages
| Package | Versions |
|---|---|
| PyPI · aiohttp | introduced 0, fixed 3.14.3 |
References
- 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 WEB
- https://github.com/aio-libs/aiohttp PACKAGE
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3 WEB
- https://pypi.org/project/aiohttp PACKAGE
- https://github.com/advisories/GHSA-cq5v-8q36-5273 ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-69244 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |