PT-2026-45836 · Aio Libs · Aiohttp

Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-47265

Mitre

CVSS v4.0

6.6

Medium

Base vector

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

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.

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-47265

Affected Products

Aiohttp

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-47265 · Security Note
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hg6j-4rv6-33pg · Note
• https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478 · Note