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  <updated>2026-10-03T12:32:27.096765+00:00</updated>
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    <id>https://vulnerability.circl.lu/vuln/cve-2026-27942</id>
    <title>CVE-2026-27942 — fast-xml-parser has stack overflow in XMLBuilder with preserveOrder</title>
    <updated>2026-10-03T12:32:27.100757+00:00</updated>
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      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> NaturalIntelligence fast-xml-parser</p>
<p>fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with `preserveOrder:true`. Version 5.3.8 fixes the issue. As a workaround, use XML builder with `preserveOrder:false` or check the input data before passing to builder.</p></div>
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    <link href="https://vulnerability.circl.lu/vuln/cve-2026-27942"/>
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