PYSEC-2026-2100

vendorUSosv

view advisory published 2026-04-01Licence: CC-BY-4.0

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-34518US	medium5.3	0.34% (27th)	—	2026-04-01
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 Authoriza…

references

External citations — patches, advisories, analysis.

https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6FIX
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4ADVISORY
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9FIX

scry

Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.

Free scan