CVE-2026-85394
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductMpdavis Python-jose
PublishedSep 3, 2026
First seenSep 3, 2026
Weakness typeCWE-347CWE-347
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mpdavis python-jose | v ≤ 3.5.0 | — |
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