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CVE-2026-34518 — AIOHTTP: Cookie and Proxy-Authorization headers leaked on cross-origin redirect

Affected: aio-libs aiohttp

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.

GHSA-966j-vmvw-g2g9 — AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect

Affected: PyPI: aiohttp

### Summary

When following redirects to a different origin, aiohttp drops the Authorization header, but retains the Cookie and Proxy-Authorization headers.

### Impact

The Cookie and Proxy-Authorizations headers could contain sensitive information which may be leaked to an unintended party after following a redirect.

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

PYSEC-2026-2100

Affected: PyPI: aiohttp