{"id":"UBUNTU-CVE-2024-52595","details":"lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.0, the HTML Parser in lxml does not properly handle context-switching for special HTML tags such as `\u003csvg\u003e`, `\u003cmath\u003e` and `\u003cnoscript\u003e`. This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability. Via `remove_tags`, one may specify tags to remove - their content is moved to their parents' tags. Via `kill_tags`, one may specify tags to be removed completely. Via `allow_tags`, one may restrict the set of permissible tags, excluding context-switching tags like `\u003csvg\u003e`, `\u003cmath\u003e` and `\u003cnoscript\u003e`.","modified":"2026-05-20T16:09:44.618814209Z","published":"2024-11-19T22:15:00Z","upstream":["CVE-2024-52595"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-52595"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2024-52595"},{"type":"REPORT","url":"https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-5jfw-gq64-q45f"},{"type":"REPORT","url":"https://github.com/fedora-python/lxml_html_clean/pull/19"},{"type":"REPORT","url":"https://github.com/fedora-python/lxml_html_clean/commit/c5d816f86eb3707d72a8ecf5f3823e0daa1b3808"}],"affected":[{"package":{"name":"lxml-html-clean","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/lxml-html-clean?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.0-0ubuntu1","0.1.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.1.1-1","binary_name":"python3-lxml-html-clean"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-52595.json"}},{"package":{"name":"lxml-html-clean","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/lxml-html-clean?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1-1","0.4.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-lxml-html-clean","binary_version":"0.4.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-52595.json"}},{"package":{"name":"lxml-html-clean","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/lxml-html-clean?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.2-1","0.4.3-1","0.4.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-lxml-html-clean","binary_version":"0.4.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-52595.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H"},{"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"}]}