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Vulnerability record · CVE-2026-42544 · published 12 May 2026

CVE-2026-42544: Improper input validation vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.46% · top 62.6% CWE-20 · Improper input validationCWE-248 · CWE-248 Deferred
7.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-42544), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.