CVE-2025-69225: Aiohttp

Medium severity, CVSS 5.3. 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 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 products

• Aiohttp Aiohttp: before 3.13.3 (fixed in 3.13.3)

Published 2026-01-06. Last modified 2026-09-30.