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TI-2026-57717 Aliases CVE-2026-83618GHSA-vr34-hp96-76pp

xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedded line terminator

Priority HIGH 79CWE-625Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0057 47th percentileScored 2026-11-07
Fix Fixed xmldom (xmldom): 0.9.12xmldom (@xmldom): 0.9.12+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
xmldomxmldom0.9.10 to before 0.9.120.9.12Patch availableCNA
xmldomxmldom0.9.10 to before 0.9.120.9.12Patch availableCNA
—@xmldom/xmldom (npm)0.9.10 to before 0.9.120.9.12Patch availableGHSA-vr34-hp96-76pp
  • xmldom Vendorxmldom Affected 0.9.10 to before 0.9.12 Fixed in 0.9.12 Patch available CNA
  • xmldom Vendorxmldom Affected 0.9.10 to before 0.9.12 Fixed in 0.9.12 Patch available CNA
  • @xmldom/xmldom (npm) Vendor— Affected 0.9.10 to before 0.9.12 Fixed in 0.9.12 Patch available GHSA-vr34-hp96-76pp

Remediation

  • Fix · CNA xmldom (xmldom) Fixed in 0.9.12
  • Fix · CNA xmldom (@xmldom) Fixed in 0.9.12
  • Fix · GHSA-vr34-hp96-76pp @xmldom/xmldom (npm) Fixed in 0.9.12 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-83618
  2. 2026-10-03 Alias added: GHSA-vr34-hp96-76pp

References

Advisory 1

Other 5

  • TI-2022-18728 xmldom allows multiple root nodes in a DOM CVSS 3.1CRITICAL 9.8
  • TI-2026-57716 xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator CVSS 4.0HIGH 8.7
  • TI-2026-57715 xmldom: Processing Instruction Target Injection Bypasses requireWellFormed CVSS 4.0HIGH 8.7
  • TI-2026-57714 xmldom: Quadratic-memory consumption CVSS 4.0HIGH 8.7
  • TI-2026-57712 xmldom: Quadratic-time attribute deduplication CVSS 4.0HIGH 8.7
  • TI-2026-57711 xmldom: HTML raw-text closing-tag case mismatch causes output amplification CVSS 4.0HIGH 8.7
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences