{"id":"USN-4666-2","summary":"lxml vulnerability","details":"USN-4666-1 partially fixed a vulnerability in lxml, but an additional patch was needed. This update provides\nthe corresponding additional patch in order to properly fix the vulnerability.\n\nOriginal advisory details:\n\n It was discovered that lxml incorrectly handled certain HTML.\n An attacker could possibly use this issue to cross-site scripting (XSS) attacks.\n","modified":"2026-02-10T04:42:00Z","published":"2020-12-11T00:39:06Z","related":["UBUNTU-CVE-2020-27783"],"upstream":["CVE-2020-27783","UBUNTU-CVE-2020-27783"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4666-2"},{"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+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.3-1ubuntu0.2+esm2"}]}],"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","3.3.3-1ubuntu0.2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"3.3.3-1ubuntu0.2+esm2","binary_name":"python-lxml"},{"binary_version":"3.3.3-1ubuntu0.2+esm2","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2020-27783","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/lxml@3.5.0-1ubuntu0.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0-1ubuntu0.3"}]}],"versions":["3.4.4-1","3.5.0-1","3.5.0-1build1","3.5.0-1ubuntu0.1","3.5.0-1ubuntu0.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.5.0-1ubuntu0.3","binary_name":"python-lxml"},{"binary_version":"3.5.0-1ubuntu0.3","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-2.json","cves_map":{"ecosystem":"Ubuntu:16.04:LTS","cves":[{"id":"CVE-2020-27783","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/lxml@4.2.1-1ubuntu0.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.1-1ubuntu0.3"}]}],"versions":["4.0.0-1","4.1.0-1","4.2.0-1","4.2.1-1","4.2.1-1ubuntu0.1","4.2.1-1ubuntu0.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.2.1-1ubuntu0.3","binary_name":"python-lxml"},{"binary_version":"4.2.1-1ubuntu0.3","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-2.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2020-27783","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/lxml@4.5.0-1ubuntu0.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.0-1ubuntu0.2"}]}],"versions":["4.4.1-1","4.4.1-1build1","4.4.2-1","4.5.0-1","4.5.0-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.5.0-1ubuntu0.2","binary_name":"python-lxml"},{"binary_version":"4.5.0-1ubuntu0.2","binary_name":"python3-lxml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4666-2.json","cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2020-27783","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}}],"schema_version":"1.7.3"}