{"id":"CVE-2026-83617","summary":"xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator","details":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/grammar.js, which inherits the multiline flag. A name with a valid first line followed by U+000A, U+000D, U+2028, or U+2029 and breakout markup therefore passes validation and is emitted verbatim in element start and end tags or attribute names. This bypasses the strict-serialization checks introduced for the earlier element-name and attribute-name injection advisories, while the default serialization path remains outside the strict guarantee. This issue is fixed in @xmldom/xmldom version 0.9.12.","aliases":["GHSA-jxjr-3g7g-3944"],"modified":"2026-09-03T03:48:17.185579812Z","published":"2026-09-01T14:47:46.526Z","database_specific":{"cwe_ids":["CWE-625","CWE-91"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83617.json","cna_assigner":"GitHub_M"},"references":[{"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-2026-83617.json"},{"type":"ADVISORY","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-jxjr-3g7g-3944"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83617"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/pull/1071"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xmldom/xmldom","events":[{"introduced":"1f0610959ab7b82cc7ad702d1be0243efc5791c0"},{"fixed":"7b2ec67e1750daadd0bb06c92e875e726544a362"},{"fixed":"0af8cf829d8a92bbac612903422c6947f5458f06"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0.9.11"},{"fixed":"0.9.12"}]}}],"versions":["0.9.11"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83617.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:H/VA:N/SC:N/SI:N/SA:N"}]}