CVE-2026-69243

AIOHTTP: HTTP request smuggling via WebSocket upgrade

Published: Aug 3, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-444

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-444

Affected Products

aio-libs

oss-projectaka aiohttp, aiosmtpd, aiohttp session

aiohttpLibrary

OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

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

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