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CVE-2026-69243— AIOHTTP: HTTP request smuggling via WebSocket upgrade

Quick assessment

Affected
aio-libs aiohttp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

aio-libs Async http client/server framework是aio-libs组织的一款异步HTTP客户端/服务器框架。 aio-libs Async http client/server framework 3.14.2之前版本存在输入验证错误漏洞，该漏洞源于HTTP解析器在处理WebSocket升级请求时存在边界问题，可能导致请求走私攻击。

CVSS 6.3 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.2 affected
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I. Basic Information for CVE-2026-69243

Vulnerability Information
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Vulnerability Title
AIOHTTP: HTTP request smuggling via WebSocket upgrade
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
aio-libs Async http client/server framework 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aio-libs Async http client/server framework是aio-libs组织的一款异步HTTP客户端/服务器框架。 aio-libs Async http client/server framework 3.14.2之前版本存在输入验证错误漏洞，该漏洞源于HTTP解析器在处理WebSocket升级请求时存在边界问题，可能导致请求走私攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
aio-libs aiohttp < 3.14.2 -

II. Public POCs for CVE-2026-69243

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III. Intelligence Information for CVE-2026-69243

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Patches & Fixes for CVE-2026-69243 (2)

Vendor Pages for CVE-2026-69243 (1)

Other References for CVE-2026-69243 (1)

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-444

V. Comments for CVE-2026-69243

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