CVE-2026-83618
Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteral_match and SystemLiteral_match expressions produced by reg() in lib/grammar.js, which inherit the multiline flag. A complete valid literal on the first line can therefore satisfy the matcher while U+000A, U+000D, U+2028, or U+2029 and breakout markup remain in the emitted <!DOCTYPE ...> declaration. This bypasses the strict-serialization mitigation for the earlier DocumentType injection advisory; creation and direct property assignment remain unvalidated by design. This issue is fixed in @xmldom/xmldom version 0.9.12.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@xmldom/xmldomnpm | >= 0.9.10, < 0.9.12 | 0.9.12 |
Affected products
1Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-vr34-hp96-76ppghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-83618ghsaADVISORY
- github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362nvdWEB
- github.com/xmldom/xmldom/pull/1071nvdWEB
- github.com/xmldom/xmldom/releases/tag/0.9.12nvdWEB
- github.com/xmldom/xmldom/security/advisories/GHSA-vr34-hp96-76ppnvdWEB
News mentions
1- Xmldom npm Package: Fifteen Parsing and Serialization Vulnerabilities Disclosed TogetherVypr Intelligence · Sep 1, 2026