CVE-2026-42544

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/12/2026

Last Modified5/13/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-20CWE-248CWE-400

References

https://github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6(security-advisories@github.com)

IOC Correlations

No correlations recorded

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