CVE-2026-69243
Medium · CVSS 6.3Published 2026-08-03
CVSS
6.3
Medium
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-69243?
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.
CVSS Score Explained
CVSS 6.3 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98
- ›https://github.com/aio-libs/aiohttp/pull/13017
- PATCHhttps://github.com/aio-libs/aiohttp/releases/tag/v3.14.2
- ›https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v
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