HIGHCVSS v3.1 7.4Vulnerability
CVE-2026-120459
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.
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-11-02T16:55:11.069321+00:00
- Cvss severity
- HIGH
- Cvss score
- 7.4
- Retrieved at
- 2026-11-02T16:56:00+00:00
- Score
- 7.4
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-120459
- Cvss vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- First seen by Signal
- 2026-11-02T16:50:29+00:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published at
- 2026-11-02T15:17:29.867
- Last modified
- 2026-11-02T15:17:29.867
Related Entities (1)
HAS_WEAKNESS (1)
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