TI-2026-57716 Aliases CVE-2026-83617 GHSA-jxjr-3g7g-3944

xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator

HIGH 77CWE-625Published 2026-09-01 · Updated 2026-09-01

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: Partial Red Hat: 1 without a fix

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

Summary

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/grammar.js, which inherits the multiline flag. A name with a valid first line followed by U+000A, U+000D, U+2028, or U+2029 and breakout markup therefore passes validation and is emitted verbatim in element start and end tags or attribute names. This bypasses the strict-serialization checks introduced for the earlier element-name and attribute-name injection advisories, while the default serialization path remains outside the strict guarantee. 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 Partial xmldom (xmldom): 0.9.12xmldom (@xmldom): 0.9.12+1 more productRed Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
xmldom	xmldom	0.9.11 to before 0.9.12	0.9.12	Patch available	CNA
xmldom	xmldom	0.9.11 to before 0.9.12	0.9.12	Patch available	CNA
—	@xmldom/xmldom (npm)	0.9.11 to before 0.9.12	0.9.12	Patch available	GHSA-jxjr-3g7g-3944

xmldom Vendorxmldom Affected 0.9.11 to before 0.9.12 Fixed in 0.9.12 Patch available CNA
xmldom Vendorxmldom Affected 0.9.11 to before 0.9.12 Fixed in 0.9.12 Patch available CNA
@xmldom/xmldom (npm) Vendor— Affected 0.9.11 to before 0.9.12 Fixed in 0.9.12 Patch available GHSA-jxjr-3g7g-3944

Remediation

Fix · CNA xmldom (xmldom) Fixed in 0.9.12
Fix · CNA xmldom (@xmldom) Fixed in 0.9.12
Fix · GHSA-jxjr-3g7g-3944 @xmldom/xmldom (npm) Fixed in 0.9.12 Advisory →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Fuse 7	Affected	No fix planned: Will not fix

Not affected: 6 products

Red Hat Build of Podman Desktop
Red Hat Developer Hub 1
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat OpenShift AI (RHOAI)

Timeline

2026-10-02 Threatist record created from CVE-2026-83617
2026-10-03 Alias added: GHSA-jxjr-3g7g-3944
2026-10-13 Affected versions changed · Red Hat
2026-10-27 Affected versions changed · Red Hat

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-83617

Other 5

TI-2022-18728 xmldom allows multiple root nodes in a DOM CVSS 3.1CRITICAL 9.8
TI-2026-57717 xmldom: requireWellFormed DocType publicId/systemId 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