UBUNTU-CVE-2026-120459

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Source

https://ubuntu.com/security/CVE-2026-120459

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120459.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-120459

Upstream

CVE-2026-120459

Published

2026-11-03T00:00:00Z

Modified

2026-11-04T03:30:03Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
9.1 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/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 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge JWTs because HMACKey and CryptographyHMACKey accept zero-length HMAC secrets. When an application's HS256/HS384/HS512 verification key resolves to empty, such as an oct JWK with empty k, attackers can forge tokens with arbitrary claims that jwt.decode accepts.

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-2026-120459.json"

Ubuntu:24.04:LTS / python-jose