XML Injection Affecting fast-xml-builder package, versions <1.1.5
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-FASTXMLBUILDER-16133760
- published23 Apr 2026
- disclosed17 Apr 2026
- creditstharvid
Introduced: 17 Apr 2026
NewCVE-2026-41650 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade fast-xml-builder to version 1.1.5 or higher.
Overview
Affected versions of this package are vulnerable to XML Injection in fxb.js, which does not properly handle closing delimiters for comment and CDATA values. The --> sequence in comment content and the ]]> sequence in CDATA sections can be coopted to close their respective sections early and inject JavaScript objects that will be executed when the elements are rendered and/or SOAP request is processed.