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CVE-2026-42544 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.x Severity and Vector Strings:

VolerionCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6	[email protected]	AdvisoryExploitRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	[email protected]
CWE-248	Uncaught Exception	[email protected]
CWE-400	Uncontrolled Resource Consumption	[email protected]

Affected Products

Product	Versions
Granian	All versions
CPE No CPEs found in CPE dictionary for this product. Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
May 18, 2026	CVE Modified	CISA-ADP
May 12, 2026	New CVE Received	[email protected]