{"id":"USN-8624-1","summary":"ruby-sinatra vulnerability","details":"It was discovered that Sinatra did not properly handle header parsing,\ncausing ETag generation to hang when given specific input. A remote\nattacker could possibly use this issue to cause a denial of service.","modified":"2026-07-31T02:00:30.205189679Z","published":"2026-07-29T19:09:19Z","related":["UBUNTU-CVE-2025-61921"],"upstream":["UBUNTU-CVE-2025-61921"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8624-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-61921"}],"affected":[{"package":{"name":"ruby-sinatra","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-sinatra?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.7-3ubuntu0.1~esm3"}]}],"versions":["1.4.6-2","1.4.7-3","1.4.7-3ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.7-3ubuntu0.1~esm3","binary_name":"ruby-sinatra"}],"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-8624-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2025-61921"}]}}},{"package":{"name":"ruby-sinatra","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-sinatra?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.8-1ubuntu0.1~esm3"}]}],"versions":["1.4.7-5","1.4.8-1","1.4.8-1ubuntu0.1~esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ruby-sinatra","binary_version":"1.4.8-1ubuntu0.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8624-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2025-61921"}]}}},{"package":{"name":"ruby-sinatra","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-sinatra?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.8.1-1ubuntu0.1~esm3"}]}],"versions":["2.0.5-4ubuntu1","2.0.8.1-1","2.0.8.1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.8.1-1ubuntu0.1~esm3","binary_name":"ruby-rack-protection"},{"binary_version":"2.0.8.1-1ubuntu0.1~esm3","binary_name":"ruby-sinatra"},{"binary_name":"ruby-sinatra-contrib","binary_version":"2.0.8.1-1ubuntu0.1~esm3"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-61921","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8624-1.json"}},{"package":{"name":"ruby-sinatra","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-sinatra?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.8.1-2+deb11u1ubuntu0.1~esm1"}]}],"versions":["2.0.8.1-2","2.0.8.1-2+deb11u1build0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-rack-protection","binary_version":"2.0.8.1-2+deb11u1ubuntu0.1~esm1"},{"binary_name":"ruby-sinatra","binary_version":"2.0.8.1-2+deb11u1ubuntu0.1~esm1"},{"binary_name":"ruby-sinatra-contrib","binary_version":"2.0.8.1-2+deb11u1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2025-61921"}],"ecosystem":"Ubuntu:Pro:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8624-1.json"}}],"schema_version":"1.7.5"}