{"id":"CVE-2026-83608","summary":"xmldom: DocType `name` Injection Bypasses requireWellFormed","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, the DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset under requireWellFormed: true but emits DocumentType.name verbatim. A name containing \u003e or whitespace can terminate the \u003c!DOCTYPE ...\u003e declaration and inject sibling markup; the value can be supplied through createDocumentType() on the 0.8.x and unscoped lines or through a direct DocumentType.name property write on every affected line. The default path and legacy creation-time behavior remain permissive, while the vulnerable strict path fails to enforce an XML Name. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.","aliases":["GHSA-27p8-2357-5qqv"],"modified":"2026-10-28T02:30:32.622684472Z","published":"2026-09-01T14:27:26.057Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83608.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-91"]},"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-2026-83608.json"},{"type":"ADVISORY","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-27p8-2357-5qqv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83608"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/57aec90ac57b4408ae7c5d1746bf2a693b5ed90e"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/85f12eb4d14b44de33216cfb72b50af4d24e9fdd"},{"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"},{"last_affected":"c80a161172cc4d8733583bf0cf59abfa589f6d9e"},{"introduced":"8c7c7afe89027641aa59c101d20eefedc0f54c6f"},{"fixed":"0af8cf829d8a92bbac612903422c6947f5458f06"},{"introduced":"c568938641cc1f121cef5b4df80fcfda1e489b6e"},{"fixed":"b5b8fb5b579ae1183b34e74b3bc39d7eb50a226a"},{"fixed":"57aec90ac57b4408ae7c5d1746bf2a693b5ed90e"},{"fixed":"85f12eb4d14b44de33216cfb72b50af4d24e9fdd"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"0"},{"last_affected":"0.6.0"}],"source":"AFFECTED_FIELD"},{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"0.9.0"},{"fixed":"0.9.12"}]},{"range":[{"introduced":"0.7.0"},{"fixed":"0.8.15"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"57aec90ac57b4408ae7c5d1746bf2a693b5ed90e"}]},{"range":[{"fixed":"85f12eb4d14b44de33216cfb72b50af4d24e9fdd"}],"source":"REFERENCES_COMMIT"},{"original_tag":"0.8.15","range":[{"fixed":"b5b8fb5b579ae1183b34e74b3bc39d7eb50a226a"}],"source":"REFERENCES_TAG"},{"original_tag":"0.9.12","range":[{"fixed":"0af8cf829d8a92bbac612903422c6947f5458f06"}],"source":"REFERENCES_TAG"}]}}],"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","0.6.0","0.5.0","0.4.0","0.3.0","0.2.1","0.2.0","v0.1.28-xmldom-alpha","v0.1.28-not-published","xmldom-aplha@v0.1.28","v0.1.27","0.1.27","0.1.26","0.1.25","0.1.24","0.1.23","0.1.22","0.1.21","0.1.20","0.1.19","0.1.18","0.1.17","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83608.json"}}],"schema_version":"1.9.2","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"}]}