{"id":"USN-9059-1","summary":"ruby-jwt vulnerability","details":"It was discovered that ruby-jwt incorrectly verified HMAC signatures when\nthe verification key was empty or missing. A remote attacker could possibly\nuse this issue to forge tokens and bypass authentication.","modified":"2026-11-12T17:29:27.010091139Z","published":"2026-11-11T18:33:24Z","related":["UBUNTU-CVE-2026-45363"],"upstream":["CVE-2026-45363","UBUNTU-CVE-2026-45363"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-9059-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45363"}],"affected":[{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.0-3ubuntu0.1~esm1"}]}],"versions":["1.0.0-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0-3ubuntu0.1~esm1","binary_name":"ruby-jwt"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-45363"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1ubuntu0.1~esm1"}]}],"versions":["1.5.6-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ruby-jwt","binary_version":"1.5.6-1ubuntu0.1~esm1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-45363","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json"}},{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-2ubuntu0.1~esm1"}]}],"versions":["1.5.6-1","2.1.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-jwt","binary_version":"2.1.0-2ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-45363","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json"}},{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.2-1ubuntu0.1~esm1"}]}],"versions":["2.2.2-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ruby-jwt","binary_version":"2.2.2-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:22.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-45363"}]}}},{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.1-1+deb13u1build0.24.04.1"}]}],"versions":["2.7.0-2","2.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-jwt","binary_version":"2.7.1-1+deb13u1build0.24.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-45363"}],"ecosystem":"Ubuntu:24.04:LTS"}}},{"package":{"name":"ruby-jwt","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ruby-jwt?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.1-1+deb13u1build0.26.04.1"}]}],"versions":["2.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-jwt","binary_version":"2.7.1-1+deb13u1build0.26.04.1"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-45363"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9059-1.json"}}],"schema_version":"1.9.2"}