GitHub Advisoryadvisory · PyPI

GHSA-jj3x-wxrx-4x23 AIOHTTP vulnerable to DoS when bypassing asserts

MEDIUM Published 2026-01-05 Modified 2026-01-06 Official page ↗
Aliases
CVE-2025-69227
Ecosystem
PyPI
Packages
aiohttp
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Weaknesses
CWE-835
Reviewed
2026-01-05

Affected packages

• PyPI aiohttp: < 3.13.3 → fixed in 3.13.3

Description

Summary When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body. Impact If optimisations 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. ------ Patch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259

Related

Alias · CVE (1)

  • CVE-2025-69227 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References