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CVE-2026-27942 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a	[email protected]	Patch
https://github.com/NaturalIntelligence/fast-xml-parser/pull/791	[email protected]	Issue TrackingPatch
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-fj3w-jwp8-x2g3	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-120	Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')	[email protected]

Affected Products

Product	Versions
naturalintelligence fast-xml-parser	< 4.5.4 >= 5.0.0, < 5.3.8
CPE cpe:2.3:a:naturalintelligence:fast-xml-parser:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 2, 2026	Reanalysis	[email protected]
Feb 27, 2026	Initial Analysis	[email protected]
Feb 26, 2026	New CVE Received	[email protected]