---
id: CVE-2025-69229
title: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
summary: >-
  AIOHTTP is an asynchronous HTTP client/server framework for asyncio and
  Python. In versions 3.13.2 and below, handling of chunked messages can result
  in excessive blocking CPU usage when receiving a large number of chunks. If an
  applicat…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-770
vendor: aiohttp
product: aiohttp
affected:
  - aiohttp < 3.13.3
patched:
  - aiohttp 3.13.3
published: '2026-01-06'
updated: '2026-10-11'
sourceUpdated: '2026-10-11T20:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-69229'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229
    label: security-advisories@github.com
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712
    label: security-advisories@github.com
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-69229'
  - url: 'https://github.com/aio-libs/aiohttp'
tags:
  - nvd
  - osv
  - pip
epss: 0.00404
epssPercentile: 0.34521
aliases:
  - GHSA-g84x-mcqj-x9qq
  - PYSEC-2026-1106
ecosystem: pip
ingestedAt: '2026-07-08T18:25:49.671Z'
---

## Overview

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.

## Affected

- `aiohttp < 3.13.3`

## Remediation

Upgrade past the affected range:

- `aiohttp 3.13.3`

## Package advisory (CVE-2025-69229)

Affected packages:

- `aiohttp < 3.13.3`

Patched in:

- `aiohttp 3.13.3`

Source: https://osv.dev/vulnerability/GHSA-g84x-mcqj-x9qq