CVE-2025-69224

MEDIUM

aiohttp < 3.13.3 - HTTP Request Smuggling via Non-ASCII Character Bypass

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 6.5
EPSS 0.0021
EPSS Percentile 11.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-444
Status published
Products (2)
aiohttp/aiohttp < 3.13.3
pypi/aiohttp 0 - 3.13.3PyPI
Published Jan 05, 2026
Tracked Since Feb 18, 2026