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CVE-2026-85394

python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85394

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85394

Published

python-jose

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "mpdavis",
                    "product": "python-jose",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "3.5.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:pypi/python-jose"
                }

Original source record · Cite this exact observation · Complete original publisher JSON