CVE-2026-53939 OpenIDC cjose - Cryptographic Key Generation Flaw

OpenIDC cjose 0.6.1 through 0.6.2.5 contains a cryptographic key generation flaw caused by zeroed content-encryption key in AES-CBC-HMAC JWE encryption, letting attackers decrypt and forge JWE content, exploit requires use of affected algorithms.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Cryptographic Key Generation Flaw
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-321

Vendor fix

Upgrade to version 0.6.2.6 or later; alternatively use AES-GCM encryption or supply a secure CEK.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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