# CVE-2024-52303

## Summary

- **CVE ID:** CVE-2024-52303
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-772
- **Published:** Nov 18, 2024
- **Last Modified:** Mar 13, 2026

## Description

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

- aio-libs — aiohttp (>= 3.10.6, < 3.10.11)

## References

- [CNA](https://github.com/aio-libs/aiohttp/security/advisories/GHSA-27mf-ghqm-j3j8)
- [CNA](https://github.com/aio-libs/aiohttp/commit/bc15db61615079d1b6327ba42c682f758fa96936)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.59%
- **EPSS Percentile:** 46.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._