| Name | CVE-2025-53643 |
| Description | AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1109336 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| python-aiohttp (PTS) | bullseye | 3.7.4-1 | vulnerable |
| bullseye (security) | 3.7.4-1+deb11u1 | vulnerable |
| bookworm, bookworm (security) | 3.8.4-1+deb12u1 | vulnerable |
| sid, trixie | 3.11.16-1 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[bookworm] - python-aiohttp <no-dsa> (Minor issue)
[bullseye] - python-aiohttp <postponed> (Minor issue; request smuggling)
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9548-qrrj-x5pj
https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a (v3.12.14)