{"id":"CVE-2026-89320","title":"HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K(\"\") for all inputs, voiding CBC-HMAC JWE integrity","summary":"`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 consta…","severity":"high","cvss":8.8,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-354"],"vendor":"Eclipse Foundation","product":"github.com/ThalesGroup/gose","affected":["github.com/ThalesGroup/gose >= 0.9.0 <= 0.13.0-rc1","github.com/eclipse-keypont/gose < 1.0.0-rc1"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T08:56:20.140Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89320","references":[{"url":"https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T09:20:44.057Z","slug":"CVE-2026-89320","body":"## Overview\n\n`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.\n\n## Affected\n\n- `github.com/ThalesGroup/gose >= 0.9.0 <= 0.13.0-rc1`\n- `github.com/eclipse-keypont/gose < 1.0.0-rc1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}