high7.1
CVE-2026-69244
AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
Impact
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | aiohttp | <= 3.14.2 | 3.14.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-cq5v-8q36-5273
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273
- https://github.com/aio-libs/aiohttp/pull/13223
- https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3