Vulnerability · Published Jan 5, 2026 · Assigned by GitHub_M
CVE-2025-69224AIOHTTP's Unicode processing of header values could cause parsing discrepancies
Medium 6.3
In plain English
A medium-severity security flaw in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. 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. This issue is fixed in version 3.13.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | py3-aiohttp | 3.13.3-r0 | ALPINE-CVE-2025-69224 |
| Alpine:v3.24 | py3-aiohttp | 3.13.3-r0 | ALPINE-CVE-2025-69224 |
| Debian:12 | python-aiohttp | 3.8.4-1+deb12u2 | DEBIAN-CVE-2025-69224 |
| Debian:13 | python-aiohttp | 3.11.16-1+deb13u1 | DEBIAN-CVE-2025-69224 |
| Debian:14 | python-aiohttp | 3.13.3-1 | DEBIAN-CVE-2025-69224 |
| PyPI | aiohttp | 3.13.3 | PYSEC-2026-1099 |
| PyPI | aiohttp | 3.13.3 | GHSA-69f9-5gxw-wvc2 |
| Ubuntu:25.10 | python-aiohttp | 3.11.16-1ubuntu0.1 | UBUNTU-CVE-2025-69224 |
Affected products (as reported)
Weakness: CWE-444 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N