Granian: Unauthenticated DoS via WebSocket subprotocol header panic
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-42544. PoCs published by dwisiswant0.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-42544, a denial-of-service vulnerability in Granian ASGI/WSGI server. The exploit sends a crafted WebSocket upgrade request with non-ASCII bytes in the Sec-WebSocket-Protocol header, causing the server to panic and abort.
Description
Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction path, before the ASGI application is invoked. This vulnerability is fixed in 2.7.4.
Exploits (1)
This repository contains a functional exploit for CVE-2026-42544, a denial-of-service vulnerability in Granian ASGI/WSGI server. The exploit sends a crafted WebSocket upgrade request with non-ASCII bytes in the Sec-WebSocket-Protocol header, causing the server to panic and abort.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H