XML Injection Affecting fast-xml-builder package, versions <1.1.5
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-FASTXMLBUILDER-16133760
- published23 Apr 2026
- disclosed17 Apr 2026
- creditstharvid
Introduced: 17 Apr 2026
CVE-2026-41650 (opens in a new tab)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.
Note:
The fix for this issue introduced CVE-2026-44664 and users are strongly recommend to upgrade to 1.1.6 instead of 1.1.5