PYSEC-2026-3546
AIOHTTP: HTTP request smuggling via WebSocket upgrade
At a glance
- Published
- Updated
- CVE
- CVE-2026-69243
- Aliases
- GHSA-mfx4-hv73-q22v
- CVSS_V4
- 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
Affected packages
| Package | Versions |
|---|---|
| PyPI · aiohttp | introduced 0, fixed 3.14.2 |
References
- 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 WEB
- https://github.com/aio-libs/aiohttp PACKAGE
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2 WEB
- https://pypi.org/project/aiohttp PACKAGE
- https://github.com/advisories/GHSA-mfx4-hv73-q22v ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-69243 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |