CVE-2025-69227

HIGH

aiohttp < 3.13.3 - Denial of Service via POST Body Processing

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 allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0034
EPSS Percentile 25.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-835
Status published
Products (2)
aiohttp/aiohttp < 3.13.3
pypi/aiohttp 0 - 3.13.3PyPI
Published Jan 06, 2026
Tracked Since Feb 18, 2026