Fast Xml Parser CVE-2026-27942
HIGH
GHSA-fj3w-jwp8-x2g3
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
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.
AnalysisAI
Stack overflow denial of service in fast-xml-parser versions prior to 5.3.8 occurs when the XML builder is used with the preserveOrder option enabled, causing the application to crash. An attacker can trigger this vulnerability remotely by sending specially crafted XML input, resulting in service unavailability for applications using the affected library. …
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RemediationAI
Within 24 hours: Identify all applications and services using fast-xml-parser and document current versions in use. Within 7 days: Upgrade fast-xml-parser to version 5.3.8 or later across all development, staging, and production environments, and conduct testing to validate functionality. …
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