Description
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.
Published: 2026-09-03
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 03 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Description 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.
Title python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret
First Time appeared Python-jose Project
Python-jose Project python-jose
Weaknesses CWE-347
CPEs cpe:2.3:a:python-jose_project:python-jose:*:*:*:*:*:*:*:*
Vendors & Products Python-jose Project
Python-jose Project python-jose
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': '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'}


Subscriptions

Python-jose Project Python-jose
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-03T18:54:26.563Z

Reserved: 2026-09-03T18:10:58.475Z

Link: CVE-2026-85394

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-03T19:17:31.257

Modified: 2026-09-03T19:17:31.257

Link: CVE-2026-85394

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses