MEDIUM5.3

PYSEC-2026-2099

Quick fix

PYSEC-2026-2099 — aiohttp: upgrade to the fixed version with the command below.

pip install --upgrade 'aiohttp>=3.13.4'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/aiohttp

Introduced in: 0Fixed in: 3.13.4

Fixpip install --upgrade 'aiohttp>=3.13.4'

References

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