---
schema_version: '1.0'
id: security-20260714-0a3800
url: https://osv.dev/vulnerability/PYSEC-2026-2098
url_hash: 0a38002c4a1c303721e9fcfc725c15d3c7e5b9d34cc18d985bed5e0ecae775c0
canonical_url: https://osv.dev/vulnerability/PYSEC-2026-2098
source: osv:pypa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34516
- PYSEC-2026-2098
- severity:CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- aiohttp
- PyPI
lang: en
published_at: '2026-04-01T21:16:59Z'
fetched_at: '2026-07-14T06:42:23Z'
updated_at: '2026-07-14T06:42:55Z'
status: published
content_hash: 28906f972f6ea5fd8db75a14c072d9d755f33bd1d44fdd9a3ee4be2cad6007d2
license_note: full
summary: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.
  Prior to version 3.13.4, a response with an excessive number of multipart headers
  may be allowed to use more memory than intended, potentially allowing a DoS vulnerability.
  This issue has been patched
summary_source: rss
summary_en: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and
  Python. Prior to version 3.13.4, a response with an excessive number of multipart
  headers may be allowed to use more memory than intended, potentially allowing a
  DoS vulnerability. This issue has been patched
entities: []
key_facts: []
related: []
related_auto: []
title: CVE-2026-34516 — aiohttp
---

# CVE-2026-34516 — aiohttp

## TL;DR
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. This issue has been patched

## Key Points
- cve / CVE-2026-34516 / PYSEC-2026-2098 / severity:CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X / aiohttp / PyPI

## Details
**Severity:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
**Advisory:** PYSEC-2026-2098 (CVE-2026-34516)

**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, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. 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/8a74257b3804c9aac0bf644af93070f68f6c5a6f
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647

_Data: OSV.dev (upstream: pypa) — https://osv.dev/vulnerability/PYSEC-2026-2098_

## Source
元記事: [CVE-2026-34516 — aiohttp](https://osv.dev/vulnerability/PYSEC-2026-2098) — published 2026-04-01T21:16:59Z