CVE-2026-42544

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Source
https://cve.org/CVERecord?id=CVE-2026-42544
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42544.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42544
Aliases
Downstream
Related
Published
2026-05-12T21:46:19.734Z
Modified
2026-07-08T08:13:24.941655101Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Granian: Unauthenticated DoS via WebSocket subprotocol header panic
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42544.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-20",
        "CWE-248",
        "CWE-400"
    ]
}
References

Affected packages

Git / github.com/emmett-framework/granian

Affected ranges

Type
GIT
Repo
https://github.com/emmett-framework/granian
Events
Introduced
996637c3f0cc1faaff427adfd92f565343b39f73
Fixed
84af73d40b6416a8e89504055ab9db413a4b1e24
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "1.2.0"
        },
        {
            "fixed": "2.7.4"
        }
    ]
}

Affected versions

v1.*
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.3.0
v1.3.1
v1.3.2
v1.4.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.7.0
v1.7.1
v1.7.2
v1.7.3
v1.7.4
v1.7.5
v1.7.6
v2.*
v2.0.0
v2.0.1
v2.1.0
v2.1.1
v2.1.2
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.2.5
v2.2.6
v2.3.0
v2.3.1
v2.3.2
v2.3.3
v2.3.4
v2.4.0
v2.4.1
v2.4.2
v2.5.0
v2.5.1
v2.5.2
v2.5.3
v2.6.0
v2.6.1
v2.7.0
v2.7.1
v2.7.2
v2.7.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42544.json"