---
schema_version: '1.0'
id: security-20260714-187376
url: https://osv.dev/vulnerability/PYSEC-2026-2100
url_hash: 187376783a62521b52d90d4a09db01c51156a49ca81721e62aadc1f26ff0c92e
canonical_url: https://osv.dev/vulnerability/PYSEC-2026-2100
source: osv:pypa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34518
- PYSEC-2026-2100
- 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: '2026-04-01T21:17:00Z'
fetched_at: '2026-07-14T06:42:23Z'
updated_at: '2026-07-14T06:42:55Z'
status: published
content_hash: 51792f3f56cbec028bb31b8b95fea692cc23ce2767c3b2eb2bc1772f253b4fdd
license_note: full
summary: '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 '
summary_source: rss
summary_en: '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 '
entities: []
key_facts: []
related: []
related_auto: []
title: CVE-2026-34518 — aiohttp
---

# CVE-2026-34518 — aiohttp

## TL;DR
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 

## Key Points
- cve / CVE-2026-34518 / PYSEC-2026-2100 / 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:** PYSEC-2026-2100 (CVE-2026-34518)

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

**Details:**
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.

**References:**
- https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
- https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9

_Data: OSV.dev (upstream: pypa) — https://osv.dev/vulnerability/PYSEC-2026-2100_

## Source
元記事: [CVE-2026-34518 — aiohttp](https://osv.dev/vulnerability/PYSEC-2026-2100) — published 2026-04-01T21:17:00Z