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CVE-2025-69224

Medium

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. 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. This issue is fixed in version 3.13.3.

SeverityMedium
CVSS6.5
Exploit probability—
ProductAiohttp
PublishedJan 5, 2026
First seenJan 5, 2026
Weakness typeCWE-444CWE-444

How to fix

Update
  • aiohttp aiohttp3.13.3 or later
  • aiohttp3.13.3 or later

Affected products

ProductAffected versionsFixed in
aiohttp aiohttpv < 3.13.33.13.3
aiohttpPyPIv < 3.13.33.13.3

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