PT-2026-121818

CVE-2026-89320

·

Published

2026-10-23

·

Updated

2026-10-23

Description by

CVSS 4.0
8.8
High
MetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
HmacShaCryptor.Hash never hashed its input. For any input it returned HMAC K("") — the MAC of the empty message under the key. Every AES-CBC-HMAC JWE produced or verified by gose therefore carried an authentication tag that is constant per key and independent of the message, removing ciphertext integrity entirely.
Exploitability
Fix
Vendors
Affected products
Weakness enumeration
CWE-354: Improper Validation of Integrity Check Value
Related identifiers
CVE-2026-89320
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