cvedb.io
CVE-2025-53643
HIGH · CVSS 7.5
EPSS exploitation probability: 0%
Published 2025-07-14T21:15:27.827 · Last modified 2026-06-17T09:38:37.710

Summary

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.

Affected products

aiohttp — aiohttp

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.