{"id":"UBUNTU-CVE-2026-83611","details":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as \u003c/a\\njunk\u003e, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.","modified":"2026-09-16T14:02:37.314425030Z","published":"2026-09-01T15:17:00Z","upstream":["CVE-2026-83611"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-83611"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-83611"},{"type":"REPORT","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"},{"type":"REPORT","url":"https://github.com/xmldom/xmldom/pull/1071"},{"type":"REPORT","url":"https://github.com/xmldom/xmldom/pull/1072"}],"affected":[{"package":{"name":"node-xmldom","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-xmldom?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.27+ds-1","0.1.27+ds-1+deb10u2build0.20.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.1.27+ds-1+deb10u2build0.20.04.1","binary_name":"node-xmldom"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83611.json"}},{"package":{"name":"node-xmldom","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-xmldom?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.5.0-1","0.7.3-1","0.7.5-1","0.7.5-1ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.7.5-1ubuntu0.22.04.1","binary_name":"node-xmldom"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83611.json"}},{"package":{"name":"node-xmldom","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-xmldom?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.6-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.8.6-1","binary_name":"node-xmldom"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83611.json"}},{"package":{"name":"node-xmldom","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-xmldom?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.6-1","0.9.8-1","0.9.8-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.8-2","binary_name":"node-xmldom"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83611.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}