{"id":"CVE-2026-89320","summary":"HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K(\"\") for all inputs, voiding CBC-HMAC JWE integrity","details":"`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.","aliases":["GHSA-h6w5-722x-2h3m"],"modified":"2026-11-04T02:30:49.508798423Z","published":"2026-10-23T08:56:20.140Z","database_specific":{"cwe_ids":["CWE-354"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89320.json","cna_assigner":"eclipse"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89320.json"},{"type":"ADVISORY","url":"https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89320"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-keypont/gose","events":[{"introduced":"4b6dc6c722b20dc24cac70da52704b6027810e69"},{"last_affected":"bc195a14438f6607e266d8a12e529260272b060b"},{"introduced":"0"},{"fixed":"3d12061410a75212322bd51c7c91a56b7dfbcea6"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"0.9.0"},{"last_affected":"0.13.0-rc1"}]},{"strategy":"StandardRange","range":[{"introduced":"0"},{"fixed":"1.0.0-rc1"}],"source":"AFFECTED_FIELD"}]}}],"versions":["v0.12.1-rc1","v0.12.0","v0.13.0-rc1","v0.10.0","v0.9.1","v0.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89320.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"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"}]}