Vulnerability · Published Jan 5, 2026 · Assigned by GitHub_M
CVE-2025-69225AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
Low 2.7
In plain English
A low-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 0.3% (higher than 21% 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 contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. 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-2025-69225 |
| Alpine:v3.24 | py3-aiohttp | 3.13.3-r0 | ALPINE-CVE-2025-69225 |
| Debian:12 | python-aiohttp | 3.8.4-1+deb12u2 | DEBIAN-CVE-2025-69225 |
| Debian:13 | python-aiohttp | 3.11.16-1+deb13u1 | DEBIAN-CVE-2025-69225 |
| Debian:14 | python-aiohttp | 3.13.3-1 | DEBIAN-CVE-2025-69225 |
| PyPI | aiohttp | 3.13.3 | PYSEC-2026-1109 |
| PyPI | aiohttp | 3.13.3 | GHSA-mqqc-3gqh-h2x8 |
| Ubuntu:25.10 | python-aiohttp | 3.11.16-1ubuntu0.1 | UBUNTU-CVE-2025-69225 |
Affected products (as reported)
Weakness: CWE-444 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U