PYSEC-2026-2100

At a glance

Published: 2026-04-01 21:17 UTC
Updated: 2026-07-13 07:15 UTC
CVE: CVE-2026-34518
Aliases: GHSA-966j-vmvw-g2g9
CVSS_V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Description

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.

Affected packages

Package	Versions
PyPI · aiohttp	introduced 0, fixed 3.13.4

References

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 ADVISORY
https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6 FIX
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9 FIX

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database