UBUNTU-CVE-2026-85394

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Source
https://ubuntu.com/security/CVE-2026-85394
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85394.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-85394
Upstream
Published
2026-09-04T00:00:00Z
Modified
2026-09-05T06:16:18Z
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
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's public key can forge HS256 tokens that pass verification when algorithms are not explicitly restricted. This is an incomplete fix for CVE-2024-33663.

References

Affected packages

Ubuntu:22.04:LTS / python-jose

Package

Name
python-jose
Purl
pkg:deb/ubuntu/python-jose?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.0+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jose",
            "binary_version": "3.3.0+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85394.json"

Ubuntu:24.04:LTS / python-jose

Package

Name
python-jose
Purl
pkg:deb/ubuntu/python-jose?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.3.0+dfsg-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jose",
            "binary_version": "3.3.0+dfsg-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85394.json"