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PYSEC-2026-2098

Quick fix

PYSEC-2026-2098 — 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, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. 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/8a74257b3804c9aac0bf644af93070f68f6c5a6f[FIX]
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647[FIX]