CVE-2026-69243

UNKNOWN 0.0

AIOHTTP: HTTP request smuggling via WebSocket upgrade

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.

CWE	CWE-444
Vendor	aio-libs
Product	aiohttp
Published	Aug 3, 2026

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Affected Versions

aio-libs / aiohttp

< 3.14.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v github.com: https://github.com/aio-libs/aiohttp/pull/13017 github.com: https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98 github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2