{"id":"UBUNTU-CVE-2026-26278","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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.","modified":"2026-06-30T18:17:41.414436168Z","published":"2026-02-19T20:25:00Z","upstream":["CVE-2026-26278"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-26278"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-26278"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/910dae5be2de2955e968558fadf6e8f74f117a77"},{"type":"REPORT","url":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6"}],"affected":[{"package":{"name":"node-webfont","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-webfont?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-2026-26278.json"}},{"package":{"name":"node-webfont","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-webfont?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-2026-26278.json"}},{"package":{"name":"node-webfont","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-webfont?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.4.0+dfsg2+~cs35.7.26-13ubuntu2","11.4.0+dfsg2+~cs35.7.26-14","11.4.0+dfsg2+~cs35.7.26-15","11.4.0+dfsg2+~cs35.7.26-16build1","11.4.0+dfsg2+~cs35.7.26-18"],"ecosystem_specific":{"binaries":[{"binary_name":"node-webfont","binary_version":"11.4.0+dfsg2+~cs35.7.26-18"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26278.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}