GitHub Advisoryadvisory · PyPI

GHSA-pqxq-w44r-73xw AIOHTTP: Pure-Python parser request smuggling

MEDIUM Published 2026-10-20 Modified 2026-10-20 Official page ↗
Aliases
CVE-2026-111750
Ecosystem
PyPI
Packages
aiohttp
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
Weaknesses
CWE-444
Reviewed
2026-10-20

Affected packages

• PyPI aiohttp: < 3.14.4 → fixed in 3.14.4

Description

Summary The pure Python parser is vulnerable to an HTTP request smuggling attack. Impact If users are using the Python parser (`AIOHTTP_NO_EXTENSIONS`, or not a standard wheel installed), then an application may be vulnerable to a request smuggling attack. Workaround Switch to the default C parser.

Related

Alias · CVE (1)

  • CVE-2026-111750 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (1)

  • CWE-444 Inconsistent Interpretation of HTTP Requests weakness

References