CVE-2026-34518

MEDIUM

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

Title source: cna

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.

References (3)

Scores

CVSS v3 5.3
EPSS 0.0004
EPSS Percentile 11.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
aiohttp/aiohttp < 3.13.4
aio-libs/aiohttp < 3.13.4
pypi/aiohttp 0 - 3.13.4PyPI
Published Apr 01, 2026
Tracked Since Apr 02, 2026