CVE-2026-27942

Name	CVE-2026-27942
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-webfont (PTS)	bookworm	11.4.0+dfsg2+~cs35.7.26-7	undetermined
	trixie	11.4.0+dfsg2+~cs35.7.26-13	undetermined
	forky, sid	11.4.0+dfsg2+~cs35.7.26-18	undetermined

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-webfont	source	(unstable)	undetermined

Notes

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