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PYSEC-2026-1105

AIOHTTP Vulnerable to Cookie Parser Warning Storm

Quick fix

PYSEC-2026-1105 — aiohttp: upgrade to the fixed version with the command below.

pip install --upgrade 'aiohttp>=3.13.3'

Details

### Summary Reading multiple invalid cookies can lead to a logging storm.

### Impact If the ``cookies`` attribute is accessed in an application, then an attacker may be able to trigger a storm of warning-level logs using a specially crafted Cookie header.

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Patch: https://github.com/aio-libs/aiohttp/commit/64629a0834f94e46d9881f4e99c41a137e1f3326

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/aiohttp

Introduced in: 0Fixed in: 3.13.3

Fixpip install --upgrade 'aiohttp>=3.13.3'

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-fh55-r93g-j68g[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2025-69230[ADVISORY]
https://github.com/aio-libs/aiohttp/commit/64629a0834f94e46d9881f4e99c41a137e1f3326[FIX]
https://github.com/aio-libs/aiohttp[PACKAGE]
https://pypi.org/project/aiohttp[PACKAGE]
https://github.com/advisories/GHSA-fh55-r93g-j68g[ADVISORY]