CVE-2025-53643 – AIOHTTP Request Smuggling Vulnerability

CVE ID : CVE-2025-53643

Published : July 14, 2025, 9:15 p.m. | 1 hour, 14 minutes ago

Description : 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.

Severity: 0.0 | NA

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