{"affected":[{"defaultStatus":"unaffected","packageName":"github.com/ThalesGroup/gose","product":"Eclipse KeyPont - GOSE","source":"CNA: eclipse","vendor":"Eclipse Foundation","versions":[{"lessThanOrEqual":"0.13.0-rc1","status":"affected","version":"0.9.0","versionType":"semver"}]},{"defaultStatus":"unaffected","packageName":"github.com/eclipse-keypont/gose","product":"Eclipse KeyPont - GOSE","source":"CNA: eclipse","vendor":"Eclipse Foundation","versions":[{"lessThan":"1.0.0-rc1","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-89320","cwes":["CWE-354"],"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.","epss":{"date":"2026-11-01","percentile":0.06867,"score":0.00174},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m"}],"kev":null,"metrics":[{"score":8.8,"severity":"high","source":"CNA: eclipse","vector":"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","version":"4.0"}],"modifiedAt":1793626185468,"publishedAt":1792745780140,"references":[{"source":"CNA: eclipse","tags":[],"url":"https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m"}],"remediation":[],"revision":"6cf8b6e06655b4ca116de14fb87ccf435bfd6f52a4745892ff62f8eaef27a252","sources":[{"modifiedAt":1793626185468,"name":"CNA: eclipse","retrievedAt":1793628556127,"url":"https://www.cve.org/CVERecord?id=CVE-2026-89320"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793628557034,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-89320"}],"ssvc":{"assessedAt":1793626119896,"automatable":"yes","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K(\"\") for all inputs, voiding CBC-HMAC JWE integrity","updatedAt":1793628557034}