CVE-2026-34518

MEDIUM5.3

AIOHTTP: Cookie and Proxy-Authorization headers leaked on cross-origin redirect

Published Apr 1, 2026

Modified 3 months ago

Details

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, when following redirects to a different origin, aiohttp drops the Authorization header, but retains the Cookie and Proxy-Authorization headers. This issue has been patched in version 3.13.4.

References

WEB

https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6

WEB

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

WEB

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-34518

CVSS Analysis

CVSS v4.0

2.7