---
schema_version: '1.0'
id: security-20260711-98fb3e
url: https://osv.dev/vulnerability/GHSA-966j-vmvw-g2g9
url_hash: 98fb3eaa6fd3209bd3830c860b71e34874e98ca01b9ce3e527a5b3af077b6650
canonical_url: https://osv.dev/vulnerability/GHSA-966j-vmvw-g2g9
source: osv:ghsa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34518
- GHSA-966j-vmvw-g2g9
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- aiohttp
- PyPI
lang: en
published_at: '2026-04-01T21:47:46Z'
fetched_at: '2026-07-11T06:37:17Z'
updated_at: '2026-07-11T06:38:28Z'
status: published
content_hash: b8fd5985920afec956e97c7d2b2a7210770137001469029d0409a0325bfd18ec
license_note: full
summary: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect
summary_source: rss
summary_en: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect
entities:
- name: earlyappleleaks
  type: person
- name: FlyingCookie
  type: artifact
- name: AND CaaaLL
  type: person
key_facts: []
related: []
related_auto:
- name: Shibu3 project
  type: organization
  weight: 1.0
- name: 豊田ルナ
  type: person
  weight: 1.0
- name: 東条澪
  type: person
  weight: 1.0
title: 'CVE-2026-34518: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin
  redirect'
---

# CVE-2026-34518: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect

## TL;DR
AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect

## Key Points
- cve / CVE-2026-34518 / GHSA-966j-vmvw-g2g9 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N / aiohttp / PyPI

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
**Advisory:** GHSA-966j-vmvw-g2g9 (CVE-2026-34518)

**Affected (your watchlist):**
- `PyPI:aiohttp` 3.13.3 → fixed in 3.13.4 [docker/docker-strands]

**Details:**
### 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.

-----

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

**References:**
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9
- https://nvd.nist.gov/vuln/detail/CVE-2026-34518
- https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6
- https://github.com/aio-libs/aiohttp
- https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

_Data: OSV.dev (upstream: ghsa) — https://osv.dev/vulnerability/GHSA-966j-vmvw-g2g9_

## Source
元記事: [CVE-2026-34518: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect](https://osv.dev/vulnerability/GHSA-966j-vmvw-g2g9) — published 2026-04-01T21:47:46Z