CVE-2026-34513

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. This issue has been patched in version 3.13.4.

References

• https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98
• https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92