aio-libs/aiohttp · Security
AIOHTTP: HTTP request smuggling via WebSocket upgrade
- GHSA ID
- GHSA-mfx4-hv73-q22v
- CVE ID
- CVE-2026-69243
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.3 · CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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
CWEs
- CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v ↗
- https://github.com/aio-libs/aiohttp/pull/13017 ↗
- https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98 ↗
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2 ↗
- https://github.com/advisories/GHSA-mfx4-hv73-q22v ↗