{"id":"USN-4666-1","summary":"lxml vulnerability","details":"It was discovered that lxml incorrectly handled certain HTML.\nAn attacker could possibly use this issue to cross-site scripting (XSS) attacks.\n","modified":"2026-02-10T04:42:00Z","published":"2020-12-09T13:28:51Z","related":["UBUNTU-CVE-2020-27783"],"upstream":["CVE-2020-27783","UBUNTU-CVE-2020-27783"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4666-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-27783"}],"affected":[{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/lxml@3.3.3-1ubuntu0.2+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.3-1ubuntu0.2+esm1"}]}],"versions":["3.2.0-1","3.3.0~beta2-1","3.3.0~beta4-1","3.3.1-1","3.3.2-1","3.3.2-1build1","3.3.3-1","3.3.3-1ubuntu0.1","3.3.3-1ubuntu0.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"3.3.3-1ubuntu0.2+esm1","binary_name":"python-lxml"},{"binary_version":"3.3.3-1ubuntu0.2+esm1","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/lxml@3.5.0-1ubuntu0.2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0-1ubuntu0.2"}]}],"versions":["3.4.4-1","3.5.0-1","3.5.0-1build1","3.5.0-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.5.0-1ubuntu0.2","binary_name":"python-lxml"},{"binary_version":"3.5.0-1ubuntu0.2","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-1.json","cves_map":{"ecosystem":"Ubuntu:16.04:LTS","cves":[]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/lxml@4.2.1-1ubuntu0.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.1-1ubuntu0.2"}]}],"versions":["4.0.0-1","4.1.0-1","4.2.0-1","4.2.1-1","4.2.1-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.2.1-1ubuntu0.2","binary_name":"python-lxml"},{"binary_version":"4.2.1-1ubuntu0.2","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-1.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/lxml@4.5.0-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.0-1ubuntu0.1"}]}],"versions":["4.4.1-1","4.4.1-1build1","4.4.2-1","4.5.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.5.0-1ubuntu0.1","binary_name":"python-lxml"},{"binary_version":"4.5.0-1ubuntu0.1","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-1.json","cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[]}}}],"schema_version":"1.7.3"}