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CVE-2026-41650— fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters

Quick assessment

Affected
NaturalIntelligence fast-xml-parser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 5.7.0之前版本存在安全漏洞，该漏洞源于XMLBuilder未转义注释内容中的-->序列或CDATA部分中的]]>序列，可能导致XML注入，进而引发跨站脚本、SOAP注入或数据篡改。

CVSS 6.1 · Medium EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
NaturalIntelligence fast-xml-parser < 5.7.0 affected
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I. Basic Information for CVE-2026-41650

Vulnerability Information
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Vulnerability Title
fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters
Source: CVE Program / CVE List V5
Vulnerability Description
fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "-->" sequence in comment content or the "]]>" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
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 5.7.0之前版本存在安全漏洞，该漏洞源于XMLBuilder未转义注释内容中的-->序列或CDATA部分中的]]>序列，可能导致XML注入，进而引发跨站脚本、SOAP注入或数据篡改。
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 < 5.7.0 -

II. Public POCs for CVE-2026-41650

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III. Intelligence Information for CVE-2026-41650

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Vendor Advisories for CVE-2026-41650 (1)

Vendor Pages for CVE-2026-41650 (1)

IV. Related Vulnerabilities

Same product: fast-xml-parser
Same vendor: NaturalIntelligence
Same weakness: CWE-91

V. Comments for CVE-2026-41650

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