HTTP Request Smuggling Affecting python311-aiohttp package, versions <3.9.3-150400.10.33.1


Severity

Recommended
0.0
low
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-SLES156-PYTHON311AIOHTTP-12485272
  • published4 Sept 2025
  • disclosed3 Sept 2025

Introduced: 3 Sep 2025

NewCVE-2025-53643  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 python311-aiohttp to version 3.9.3-150400.10.33.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python311-aiohttp package and not the python311-aiohttp package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1