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CVE-2026-89320

HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, voiding CBC-HMAC JWE integrity PUBLISHED

Description (CNA)

`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.

Affected (CNA)

Vendor / productVersions
Eclipse Foundation / Eclipse KeyPont - GOSEaffected 0.9.0 through 0.13.0-rc1
Eclipse Foundation / Eclipse KeyPont - GOSEaffected 0 before 1.0.0-rc1

CWE

CWE-354

References