CVE-2024-52303: Aiohttp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.

Affected products

• Aiohttp Aiohttp: from 3.10.6, before 3.10.11 (fixed in 3.10.11)

Published 2024-11-18. Last modified 2026-06-17.