PT-2026-84282 · Npm · Xmldom
CVE-2026-83618
·
Published
2026-08-22
·
Updated
2026-09-08
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Name of the Vulnerable Software and Affected Versions
xmldom versions 0.9.10 through 0.9.11
Description
The
requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId using PubidLiteral match and SystemLiteral match expressions produced by the reg() function in lib/grammar.js. Because these expressions inherit the multiline flag, a valid literal on the first line can satisfy the matcher while allowing line terminator characters (U+000A, U+000D, U+2028, or U+2029) and breakout markup to remain in the emitted <!DOCTYPE ...> declaration. This behavior bypasses the strict-serialization mitigation intended to prevent DocumentType injection. Note that creation and direct property assignment remain unvalidated by design.Recommendations
Update to @xmldom/xmldom version 0.9.12.
Exploit
Fix
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Related Identifiers
Affected Products
Xmldom