CVE-2026-27942

UNKNOWN 0.0

fast-xml-parser has stack overflow in XMLBuilder with preserveOrder

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-120
Vendor	naturalintelligence
Product	fast-xml-parser
Published	Feb 26, 2026
Last Updated	Feb 26, 2026

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Affected Versions

NaturalIntelligence / fast-xml-parser

< 5.3.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-fj3w-jwp8-x2g3 github.com: https://github.com/NaturalIntelligence/fast-xml-parser/pull/791 github.com: https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a