CVE-2025-69224: Aiohttp

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Aiohttp Aiohttp: before 3.13.3 (fixed in 3.13.3)

Published 2026-01-05. Last modified 2026-09-30.