Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091
- https://github.com/aio-libs/aiohttp/pull/13017
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v
FAQ
What is CVE-2026-69243?
CVE-2026-69243 is a documented vulnerability. 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...
How severe is CVE-2026-69243?
CVSS scoring is not yet available for CVE-2026-69243. Check NVD for updates.
Is there a patch for CVE-2026-69243?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.