{"id":"USN-5225-1","summary":"lxml vulnerability","details":"It was discovered that lxml incorrectly handled certain XML and HTML files.\nAn attacker could possibly use this issue to execute arbitrary code.\n","modified":"2026-06-29T13:48:42.071972302Z","published":"2022-01-12T12:46:34Z","related":["UBUNTU-CVE-2021-43818"],"upstream":["CVE-2021-43818","UBUNTU-CVE-2021-43818"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5225-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-43818"}],"affected":[{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.3-1ubuntu0.2+esm5"}]}],"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","3.3.3-1ubuntu0.2+esm2","3.3.3-1ubuntu0.2+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"python-lxml","binary_version":"3.3.3-1ubuntu0.2+esm5"},{"binary_version":"3.3.3-1ubuntu0.2+esm5","binary_name":"python3-lxml"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-43818"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5225-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0-1ubuntu0.4+esm2"}]}],"versions":["3.4.4-1","3.5.0-1","3.5.0-1build1","3.5.0-1ubuntu0.1","3.5.0-1ubuntu0.2","3.5.0-1ubuntu0.3","3.5.0-1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_name":"python-lxml","binary_version":"3.5.0-1ubuntu0.4+esm2"},{"binary_name":"python3-lxml","binary_version":"3.5.0-1ubuntu0.4+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5225-1.json","cves_map":{"cves":[{"id":"CVE-2021-43818","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"lxml","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.1-1ubuntu0.6"}]}],"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","4.2.1-1ubuntu0.3","4.2.1-1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"4.2.1-1ubuntu0.6","binary_name":"python-lxml"},{"binary_name":"python3-lxml","binary_version":"4.2.1-1ubuntu0.6"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2021-43818","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5225-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.0-1ubuntu0.5"}]}],"versions":["4.4.1-1","4.4.1-1build1","4.4.2-1","4.5.0-1","4.5.0-1ubuntu0.1","4.5.0-1ubuntu0.2","4.5.0-1ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.0-1ubuntu0.5","binary_name":"python-lxml"},{"binary_name":"python3-lxml","binary_version":"4.5.0-1ubuntu0.5"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2021-43818","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5225-1.json"}}],"schema_version":"1.7.5"}