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Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect. If a developer uses the `cookies` parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M




MEDIUM: 6.6CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

Problem types

CWE-346: Origin Validation Error

Product status

< 3.14.0
affected

References

github.com/...iohttp/security/advisories/GHSA-hg6j-4rv6-33pg

github.com/...ommit/f54c40851b0d6c4bbdab97ba518a223adda32478

cve.org (CVE-2026-47265)

nvd.nist.gov (CVE-2026-47265)

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