{"id":"UBUNTU-CVE-2026-25896","details":"fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.","modified":"2026-03-19T10:39:21.843043Z","published":"2026-02-20T21:19:00Z","upstream":["CVE-2026-25896"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-25896"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-25896"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/943ef0eb1b2d3284e72dd74f44a042ee9f07026e"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/ddcd0acf26ddd682cb0dc15a2bd6aa3b96bb1e69"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5"}],"affected":[{"package":{"name":"node-webfont","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-webfont@11.4.0+dfsg2+~cs35.7.26-7ubuntu1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.4.0+dfsg2+~cs35.7.26-7ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"11.4.0+dfsg2+~cs35.7.26-7ubuntu1","binary_name":"node-webfont"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25896.json"}},{"package":{"name":"node-webfont","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-webfont@11.4.0+dfsg2+~cs35.7.26-13ubuntu2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.4.0+dfsg2+~cs35.7.26-10","11.4.0+dfsg2+~cs35.7.26-13ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"11.4.0+dfsg2+~cs35.7.26-13ubuntu2","binary_name":"node-webfont"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25896.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}