---
id: CVE-2026-47265
aliases:
  - GHSA-hg6j-4rv6-33pg
  - PYSEC-2026-2105
title: AIOHTTP is vulnerable to cross-origin redirect with per-request cookies
summary: AIOHTTP is vulnerable to cross-origin redirect with per-request cookies
severity: medium
vendor: aiohttp
product: aiohttp
ecosystem: pip
affected:
  - aiohttp < 3.14.0
patched:
  - aiohttp 3.14.0
published: '2026-06-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:49.888335735Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-hg6j-4rv6-33pg'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hg6j-4rv6-33pg
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47265'
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478
  - url: 'https://github.com/aio-libs/aiohttp'
tags:
  - osv
  - pip
epss: 0.00213
epssPercentile: 0.1032
ingestedAt: '2026-07-13T18:57:59.162Z'
---

## Overview

### Summary

Cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect.

### Impact

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.

### Workaround

If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.

-----

Patch: https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478

## Affected packages

- `aiohttp < 3.14.0`

## Remediation

Upgrade to a patched release:

- `aiohttp 3.14.0`