CVE-2026-34517

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched in version 3.13.4.

References

• https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145
• https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3wq7-rqq7-wx6j