---
schema_version: '1.0'
id: security-20260714-667ec2
url: https://osv.dev/vulnerability/PYSEC-2026-2095
url_hash: 667ec263a0d9f4285c7460d1c2231041c64ac1dcf6ef6190bcf96b2a0fc0e4a6
canonical_url: https://osv.dev/vulnerability/PYSEC-2026-2095
source: osv:pypa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34513
- PYSEC-2026-2095
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- 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: bf6bc932c6610c544003166b80810d0800462ba212944c95ddd32528fdef372f
license_note: full
summary: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.
  Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory
  usage possibly resulting in a DoS situation. 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 unbounded DNS cache could result in excessive
  memory usage possibly resulting in a DoS situation. This issue has been patched
  in version 3.13.4.
entities: []
key_facts: []
related: []
related_auto: []
title: CVE-2026-34513 — aiohttp
---

# CVE-2026-34513 — aiohttp

## TL;DR
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. This issue has been patched in version 3.13.4.

## Key Points
- cve / CVE-2026-34513 / PYSEC-2026-2095 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H / aiohttp / PyPI

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
**Advisory:** PYSEC-2026-2095 (CVE-2026-34513)

**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 unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. 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/c4d77c3533122be353b8afca8e8675e3b4cbda98
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92

_Data: OSV.dev (upstream: pypa) — https://osv.dev/vulnerability/PYSEC-2026-2095_

## Source
元記事: [CVE-2026-34513 — aiohttp](https://osv.dev/vulnerability/PYSEC-2026-2095) — published 2026-04-01T21:16:59Z