Bug 2528187 (CVE-2026-85394) - CVE-2026-85394 jose: python-jose: python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret
Summary: CVE-2026-85394 jose: python-jose: python-jose through 3.5.0 Algorithm Confusi...
Keywords:
Status: NEW
Alias: CVE-2026-85394
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2546038 2546039 2546040 2546041
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-03 19:03 UTC by OSIDB Bzimport
Modified: 2026-10-05 18:40 UTC (History)
8 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-03 19:03:08 UTC 
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.
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