---
id: CVE-2026-111750
title: 'AIOHTTP: Pure-Python parser request smuggling'
summary: >-
  AIOHTTP is an asynchronous HTTP client/server framework for asyncio and
  Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request
  framing. An unauthenticated attacker can consequently smuggle requests when an
  applica…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L'
cvssSource: cna
cwe:
  - CWE-444
vendor: aio-libs
product: aiohttp
affected:
  - aiohttp < 3.14.4
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T17:06:37.997Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111750'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xw
    label: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xw
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83
    label: >-
      https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83
  - url: 'https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4'
    label: 'https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4'
tags:
  - cve.org
ingestedAt: '2026-10-19T17:33:42.452Z'
---

## Overview

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated attacker can consequently smuggle requests when an application uses AIOHTTP_NO_EXTENSIONS or otherwise runs without a standard wheel and an intermediary interprets the framing differently. This issue is fixed in version 3.14.4.

## Affected

- `aiohttp < 3.14.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.