CVE-2026-27942— fast-xml-parser has stack overflow in XMLBuilder with preserveOrder
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I. Basic Information for CVE-2026-27942
Vulnerability Information
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Vulnerability Title
fast-xml-parser has stack overflow in XMLBuilder with preserveOrder
Source: NVD (National Vulnerability Database)
Vulnerability 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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
fast-xml-parser 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fast-xml-parser是Natural Intelligence开源的一个库。用于在没有基于 C/C++ 的库和回调的情况下，快速验证 XML、解析 XML 和构建 XML。 fast-xml-parser 5.3.8之前版本存在安全漏洞，该漏洞源于使用preserveOrder:true的XML构建器时发生堆栈溢出，可能导致应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| NaturalIntelligence | fast-xml-parser | < 5.3.8 | - |
II. Public POCs for CVE-2026-27942
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|---|
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IV. Related Vulnerabilities
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fast-xml-parser has an entity encoding bypass via regex inje - CVE-2026-26278
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