CVE-2026-27942: fast-xml-parser has stack overflow in XMLBuilder with preserveOrder
NaturalIntelligence · fast-xml-parser
Affected: NaturalIntelligence fast-xml-parser · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 46% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- NaturalIntelligence · fast-xml-parser< 5.3.8
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- NaturalIntelligence
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-27942 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.