CVE-2026-42544

HighCVSS 7.5/10Last modified Oct 26, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20 CWE-248 CWE-400

Affected software

Vendor	Product	Versions
emmett-framework	granian	>= 1.2.0, < 2.7.4

References

Timeline

Published: May 12, 2026
Last modified: Oct 26, 2026
NVD status: Deferred

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