CVE-2026-27942 — fast-xml-parser has stack overflow in XMLBuilder with preserveOrder
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 appl…
Published: 2026-02-26 · CVSS: 2.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7