---
id: CVE-2025-69224
aliases:
  - GHSA-69f9-5gxw-wvc2
  - PYSEC-2026-1099
title: >-
  AIOHTTP's unicode processing of header values could cause parsing
  discrepancies
summary: >-
  AIOHTTP's unicode processing of header values could cause parsing
  discrepancies
severity: low
vendor: aiohttp
product: aiohttp
ecosystem: pip
affected:
  - aiohttp < 3.13.3
patched:
  - aiohttp 3.13.3
published: '2026-01-05'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:54.440954011Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-69f9-5gxw-wvc2'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-69f9-5gxw-wvc2
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-69224'
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0
  - url: 'https://github.com/aio-libs/aiohttp'
tags:
  - osv
  - pip
epss: 0.00244
epssPercentile: 0.13874
ingestedAt: '2026-07-08T18:25:46.320Z'
---

## Overview

### Summary
The Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters.

### Impact
If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections.

------

Patch: https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0

## Affected packages

- `aiohttp < 3.13.3`

## Remediation

Upgrade to a patched release:

- `aiohttp 3.13.3`