CVE-2026-69243

EIP tracks 1 public exploit for CVE-2026-69243. PoCs published by JVBotelho.

AI-analyzed exploit summary This repository contains a functional proof-of-concept for CVE-2026-69243, an HTTP request smuggling vulnerability (CWE-444) in aiohttp. The exploit demonstrates how a crafted WebSocket upgrade request with a Content-Length or chunked body can desynchronize frontend (Nginx) and backend (aiohttp) parsers, allowing smuggling of unauthorized requests (e.g., /admin).

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.