CVE-2026-120459

HighCVSS 7.4/10Last modified Nov 9, 2026

Description

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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-347

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
mpdavis	python-jose	<= 3.5.0

References

Timeline

Published: Nov 2, 2026
Last modified: Nov 9, 2026
NVD status: Awaiting Analysis

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