---
schema_version: '1.0'
id: security-20260714-4bb846
url: https://osv.dev/vulnerability/PYSEC-2026-2101
url_hash: 4bb84627266ffe74c5381e39b186d73cc05479c957f276bf6c14bb9f2fc440de
canonical_url: https://osv.dev/vulnerability/PYSEC-2026-2101
source: osv:pypa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34519
- PYSEC-2026-2101
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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: d68eac82526391e3384c0dcd48031e6697cf55aecc2cd2157bd1694bef8bf589
license_note: full
summary: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.
  Prior to version 3.13.4, an attacker who controls the reason parameter when creating
  a Response may be able to inject extra headers or similar exploits. This issue has
  been patched in version 3.13.4.
summary_source: rss
summary_en: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and
  Python. Prior to version 3.13.4, an attacker who controls the reason parameter when
  creating a Response may be able to inject extra headers or similar exploits. This
  issue has been patched in version 3.13.4.
entities: []
key_facts: []
related: []
related_auto: []
title: CVE-2026-34519 — aiohttp
---

# CVE-2026-34519 — aiohttp

## TL;DR
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

## Key Points
- cve / CVE-2026-34519 / PYSEC-2026-2101 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N / aiohttp / PyPI

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
**Advisory:** PYSEC-2026-2101 (CVE-2026-34519)

**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, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. 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/53b35a2f8869c37a133e60bf1a82a1c01642ba2b
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w

_Data: OSV.dev (upstream: pypa) — https://osv.dev/vulnerability/PYSEC-2026-2101_

## Source
元記事: [CVE-2026-34519 — aiohttp](https://osv.dev/vulnerability/PYSEC-2026-2101) — published 2026-04-01T21:17:00Z