High severityNVD Advisory· Published Oct 23, 2026

CVE-2026-89320

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Eclipse Keypont/gosellm-create

Patches

Vulnerability mechanics

References

github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3mnvd

News mentions

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cvss	0.455
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000