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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0 Patch
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-69f9-5gxw-wvc2 Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.3 · aiohttpNVD modified 2026-10-11 20:10
Affected (CPE criteria) 1
cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*