{"id":"USN-4502-1","summary":"ruby-websocket-extensions vulnerability","details":"It was discovered that websocket-extensions does not properly parse \nspecial headers. A remote attacker could use this issue to cause regex \nbacktracking, resulting in a denial of service. (CVE-2020-7663)\n","modified":"2026-02-10T04:41:55Z","published":"2020-09-16T13:07:44Z","related":["UBUNTU-CVE-2020-7663"],"upstream":["CVE-2020-7663","UBUNTU-CVE-2020-7663"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4502-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-7663"}],"affected":[{"package":{"name":"ruby-websocket-extensions","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-websocket-extensions@0.1.2-1+deb9u1build0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.2-1+deb9u1build0.16.04.1"}]}],"versions":["0.1.2-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.1.2-1+deb9u1build0.16.04.1","binary_name":"ruby-websocket-extensions"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4502-1.json","cves_map":{"cves":[{"severity":[{"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-2020-7663"}],"ecosystem":"Ubuntu:16.04:LTS"}}},{"package":{"name":"ruby-websocket-extensions","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-websocket-extensions@0.1.2-1+deb9u1build0.18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.2-1+deb9u1build0.18.04.1"}]}],"versions":["0.1.2-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.1.2-1+deb9u1build0.18.04.1","binary_name":"ruby-websocket-extensions"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4502-1.json","cves_map":{"cves":[{"severity":[{"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-2020-7663"}],"ecosystem":"Ubuntu:18.04:LTS"}}},{"package":{"name":"ruby-websocket-extensions","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-websocket-extensions@0.1.2-1+deb9u1build0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.2-1+deb9u1build0.20.04.1"}]}],"versions":["0.1.2-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.1.2-1+deb9u1build0.20.04.1","binary_name":"ruby-websocket-extensions"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4502-1.json","cves_map":{"cves":[{"severity":[{"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-2020-7663"}],"ecosystem":"Ubuntu:20.04:LTS"}}}],"schema_version":"1.7.3"}