{"id":"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 \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.","aliases":["GHSA-6h8r-xr42-gp59"],"modified":"2026-09-03T03:48:19.261955896Z","published":"2026-09-01T14:34:12.618Z","database_specific":{"cwe_ids":["CWE-1286"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83611.json","cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xmldom/xmldom","events":[{"introduced":"0"},{"introduced":"8c7c7afe89027641aa59c101d20eefedc0f54c6f"},{"introduced":"c568938641cc1f121cef5b4df80fcfda1e489b6e"},{"fixed":"0af8cf829d8a92bbac612903422c6947f5458f06"},{"fixed":"b5b8fb5b579ae1183b34e74b3bc39d7eb50a226a"},{"fixed":"4430189660b0d380ee9c9ee7550a1358688e8828"},{"fixed":"7b2ec67e1750daadd0bb06c92e875e726544a362"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"last_affected":"0.6.0"},{"introduced":"0.9.0"},{"fixed":"0.9.12"},{"introduced":"0.7.0"},{"fixed":"0.8.15"}]}}],"versions":["0.8.14","0.9.11","0.8.13","0.9.10","0.9.9","0.8.12","0.8.11","0.8.10","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.8.9","0.8.8","0.8.7","0.8.6","0.8.5","0.8.4","0.8.3","0.8.2","0.8.1","0.8.0","0.7.3","0.7.2","0.7.1","0.7.0+scoped","v0.7.0","0.7.0+unscoped","0.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}