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

Risk 66

HmacShaCryptor.Hash never hashed its input. For any input it returned HMACK("") — 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.

First published (updated )
CVE-2026-89320

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