---
schema_version: '1.0'
id: security-20260711-812ce3
url: https://osv.dev/vulnerability/GHSA-hcc4-c3v8-rx92
url_hash: 812ce348590429948c30bfbfdfde05536a761378709f2624e23c6efbd86119be
canonical_url: https://osv.dev/vulnerability/GHSA-hcc4-c3v8-rx92
source: osv:ghsa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-34513
- GHSA-hcc4-c3v8-rx92
- severity:CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
- aiohttp
- PyPI
lang: en
published_at: '2026-04-01T21:19:22Z'
fetched_at: '2026-07-11T06:37:17Z'
updated_at: '2026-07-11T06:38:28Z'
status: published
content_hash: 732cc678fa0c04e4e965b2aa1b1e665f2c63327af068b165c466705e3df9e40c
license_note: full
summary: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector
summary_source: rss
summary_en: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in
  TCPConnector
entities:
- name: affected
  type: UNKNOWN
- name: ServiceNow
  type: organization
key_facts: []
related: []
related_auto:
- name: 永井花奈
  type: person
  weight: 2.0
- name: Palestinians
  type: person
  weight: 1.0
title: 'CVE-2026-34513: AIOHTTP Affected by Denial of Service (DoS) via Unbounded
  DNS Cache in TCPConnector'
---

# CVE-2026-34513: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector

## TL;DR
AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector

## Key Points
- cve / CVE-2026-34513 / GHSA-hcc4-c3v8-rx92 / severity:CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U / aiohttp / PyPI

## Details
**Severity:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
**Advisory:** GHSA-hcc4-c3v8-rx92 (CVE-2026-34513)

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

**Details:**
### Summary

An unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation.

### Impact

If an application makes requests to a very large number of hosts, this could cause the DNS cache to continue growing and slowly use excessive amounts of memory.

-----

Patch: https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98

**References:**
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92
- https://nvd.nist.gov/vuln/detail/CVE-2026-34513
- https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98
- 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-hcc4-c3v8-rx92_

## Source
元記事: [CVE-2026-34513: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector](https://osv.dev/vulnerability/GHSA-hcc4-c3v8-rx92) — published 2026-04-01T21:19:22Z