AIOHTTP: HTTP request smuggling via WebSocket upgrade
PYSEC-2026-3546 · CVE-2026-69243 · GHSA-mfx4-hv73-q22v
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Description
Summary
The HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades.
Impact
If using the server-side component, it may be possible for an attacker to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. AIOHTT is unaware of any public exploit code.
Patch: https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98
References
- WEB https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v
- WEB https://github.com/aio-libs/aiohttp/pull/13017
- WEB https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98
- PACKAGE https://github.com/aio-libs/aiohttp
- WEB https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2
- PACKAGE https://pypi.org/project/aiohttp
- ADVISORY https://github.com/advisories/GHSA-mfx4-hv73-q22v
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-69243
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