---
id: CVE-2026-111748
title: 'AIOHTTP: Absolute-form request targets can spoof Request.scheme'
summary: >-
  AIOHTTP is an asynchronous HTTP client/server framework for asyncio and
  Python. Prior to 3.14.4, an attacker can send an absolute-form request that
  causes Request.scheme to use attacker-controlled request-target scheme data
  instead of th…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-807
vendor: aio-libs
product: aiohttp
affected:
  - aiohttp < 3.14.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-19T18:21:21.058096Z'
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:22:09.618Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111748'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-f9xw-jh8m-3mwq
    label: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-f9xw-jh8m-3mwq
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/6d4e7b01f9b951aa084a75d7356e907d4ee80411
    label: >-
      https://github.com/aio-libs/aiohttp/commit/6d4e7b01f9b951aa084a75d7356e907d4ee80411
  - 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: '2026-10-19T17:33:42.454Z'
---

## Overview

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, an attacker can send an absolute-form request that causes Request.scheme to use attacker-controlled request-target scheme data instead of the connection protocol. Applications that use Request.scheme for security decisions can consequently be tricked into treating an unencrypted connection as encrypted or an encrypted connection as unencrypted. 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.