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.
Advisories
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Fixes
Solution
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Workaround
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References
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 |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-03T18:54:26.563Z
Reserved: 2026-09-03T18:10:58.475Z
Link: CVE-2026-85394
No data.
Status : Received
Published: 2026-09-03T19:17:31.257
Modified: 2026-09-03T19:17:31.257
Link: CVE-2026-85394
No data.
OpenCVE Enrichment
No data.
Weaknesses