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[ CVE-2026-111750 · Published 19 Oct 2026 ]

AIOHTTP: Pure-Python parser request smuggling

CVSS 6.3 EPSS <1%Fix available

[ Description ]Official description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated attacker can consequently smuggle requests when an application uses AIOHTTP_NO_EXTENSIONS or otherwise runs without a standard wheel and an intermediary interprets the framing differently. This issue is fixed in version 3.14.4.

[ Fixes ]Fixes and patches

  • aiohttp 3.14.4Fixed version · GitHub Advisories · pip package aiohttp: upgrade to 3.14.4 or later (affected <= 3.14.3)

[ Packages ]Affected open-source packages

[ References ]References