CVE-2026-120459 python-jose - Authentication Bypass

python-jose <= 3.5.0 contains an authentication bypass caused by acceptance of zero-length HMAC secrets in HMACKey and CryptographyHMACKey, letting unauthenticated attackers forge JWTs with arbitrary claims, exploit requires empty verification key.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2 November 2026
Updated
3 November 2026
Weakness
CWE-347

Vendor fix

Update to a version later than 3.5.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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