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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| xmldom | xmldom | >= 0.9.10, < 0.9.12 | — |
| @xmldom | xmldom | >= 0.9.10, < 0.9.12 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-xmldom | 0.9.12-1 | — |
| Debian 13 | node-xmldom | No fix yet | — |
| Debian 12 | node-xmldom | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-xmldom | No fix yet | — |
| Ubuntu 26.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 24.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 22.04 LTS | node-xmldom | No fix yet | — |
| Ubuntu 20.04 LTS | node-xmldom | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | @xmldom/xmldom | >= 0.9.10, < 0.9.12 | 0.9.12 | GHSA-vr34-hp96-76pp |
Advisories 1
- WID-SEC-2026-3596 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026