{"id":"USN-8897-1","summary":"lxml vulnerabilities","details":"Guillem Lefait discovered that lxml incorrectly handled certain URL\nattributes. A remote attacker could possibly use this issue to bypass\nURL sanitization, leading to a cross-site scripting attack.\n(CVE-2026-49825)\n\nQiu Sihao discovered that lxml incorrectly handled untrusted XML input.\nA remote attacker could possibly use this issue to read local files and\nexpose sensitive information. This issue was only addressed in Ubuntu 24.04\nLTS and Ubuntu 26.04 LTS. (CVE-2026-41066)","modified":"2026-10-08T19:58:54.170338661Z","published":"2026-10-07T16:13:52Z","related":["UBUNTU-CVE-2026-41066","UBUNTU-CVE-2026-49825"],"upstream":["CVE-2026-41066","CVE-2026-49825","UBUNTU-CVE-2026-41066","UBUNTU-CVE-2026-49825"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8897-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41066"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-49825"}],"affected":[{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.3-1ubuntu0.2+esm6"}]}],"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","3.3.3-1ubuntu0.2+esm5"],"ecosystem_specific":{"binaries":[{"binary_name":"python-lxml","binary_version":"3.3.3-1ubuntu0.2+esm6"},{"binary_name":"python3-lxml","binary_version":"3.3.3-1ubuntu0.2+esm6"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: 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:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41066"},{"id":"CVE-2026-49825","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.0-1ubuntu0.4+esm3"}]}],"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","3.5.0-1ubuntu0.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.5.0-1ubuntu0.4+esm3","binary_name":"python-lxml"},{"binary_name":"python3-lxml","binary_version":"3.5.0-1ubuntu0.4+esm3"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2026-41066","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-49825","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.1-1ubuntu0.6+esm1"}]}],"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","4.2.1-1ubuntu0.6"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"python-lxml","binary_version":"4.2.1-1ubuntu0.6+esm1"},{"binary_name":"python3-lxml","binary_version":"4.2.1-1ubuntu0.6+esm1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-41066","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-49825","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.0-1ubuntu0.5+esm1"}]}],"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","4.5.0-1ubuntu0.5"],"ecosystem_specific":{"binaries":[{"binary_name":"python-lxml","binary_version":"4.5.0-1ubuntu0.5+esm1"},{"binary_version":"4.5.0-1ubuntu0.5+esm1","binary_name":"python3-lxml"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41066"},{"id":"CVE-2026-49825","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.0-1ubuntu0.1"}]}],"versions":["4.6.3+dfsg-0.1","4.6.4-1","4.6.4-1ubuntu1","4.7.1-1","4.8.0-1","4.8.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.8.0-1ubuntu0.1","binary_name":"python3-lxml"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2026-41066","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-49825"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.1-1ubuntu0.2"}]}],"versions":["4.9.3-1","4.9.3-1build1","4.9.4-1","5.1.0-1","5.1.0-1build1","5.1.0-1build2","5.2.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.2.1-1ubuntu0.2","binary_name":"python3-lxml"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-41066","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-49825","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8897-1.json"}},{"package":{"name":"lxml","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/lxml?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1ubuntu0.1"}]}],"versions":["6.0.1-1","6.0.1-1build1","6.0.2-1","6.0.2-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-lxml","binary_version":"6.0.2-1ubuntu0.1"}],"availability":"No subscription 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