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CVE-2026-27942

Published: Feb 26, 2026

Modified: Feb 26, 2026

PUBLISHED

Description

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.

Vendor	Product	Versions
NaturalIntelligence	fast-xml-parser	affected `< 5.3.8`

Weaknesses (CWE)

References

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

x_refsource_CONFIRM

https://github.com/NaturalIntelligence/fast-xml-parser/pull/791

x_refsource_MISC

https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a

x_refsource_MISC

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