UBUNTU-CVE-2026-102946

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Source
https://ubuntu.com/security/CVE-2026-102946
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102946.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-102946
Upstream
Published
2026-10-16T00:00:00Z
Modified
2026-10-17T12:57:56Z
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
  • Ubuntu - medium
Summary
[none]
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.

References

Affected packages

Ubuntu:26.10 / joserfc

Package

Name
joserfc
Purl
pkg:deb/ubuntu/joserfc?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.6.2-1
1.6.5-1
1.6.8-1
1.7.0-1
1.7.1-1
1.7.2-1
1.7.4-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-joserfc",
            "binary_version":  "1.7.4-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102946.json"

Ubuntu:26.04:LTS / joserfc

Package

Name
joserfc
Purl
pkg:deb/ubuntu/joserfc?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.2.2-1
1.4.0-1
1.4.1-1
1.4.3-1
1.5.0-1
1.6.2-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-joserfc",
            "binary_version":  "1.6.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102946.json"