CVE-2026-102946

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Source
https://cve.org/CVERecord?id=CVE-2026-102946
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102946.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-102946
Aliases
  • GHSA-4pp3-559j-c5c2
Downstream
Published
2026-10-15T18:28:06Z
Modified
2026-10-17T02:47:45Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json
Details

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-290",
        "CWE-345",
        "CWE-347"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json"
}
References

Affected packages

Git / github.com/authlib/joserfc

Affected ranges

Type
GIT
Repo
https://github.com/authlib/joserfc
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f409f8f058225d7686acab6546c94593e4c1bfbe
Fixed
7facdee77fc8735ad88e586b31c5b0c940ee0a78
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.7.4"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.10.0
0.11.0
0.11.1
0.12.0
0.2.0
0.3.0
0.4.0
0.5.0
0.6.0
0.7.0
0.8.0
0.9.0
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.1.0
1.2.0
1.2.1
1.2.2
1.3.0
1.3.1
1.3.2
1.3.3
1.4.0
1.4.1
1.4.3
1.5.0
1.6.0
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.7
1.7.0
1.7.1
1.7.2
1.7.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102946.json"