{"id":"CVE-2026-83611","aliases":["GHSA-6h8r-xr42-gp59"],"url":"https://o3.security/vulnerability/CVE-2026-83611","summary":"xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content","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 </a\\njunk>, 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.","published":"2026-09-01T14:34:12.618Z","modified":"2026-09-10T03:31:00.850480010Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@xmldom/xmldom","fixedVersion":"0.8.15"},{"ecosystem":"npm","name":"@xmldom/xmldom","fixedVersion":"0.9.12"},{"ecosystem":"npm","name":"xmldom","fixedVersion":null}],"fix":{"url":"https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828","label":"xmldom/xmldom@4430189"},"references":[{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.8.15"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.9.12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83611.json"},{"type":"ADVISORY","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83611"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/pull/1071"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/pull/1072"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:31:00.850480010Z"}}