CVE-2026-41650: Naturalintelligence Fast-XML-Parser

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Naturalintelligence Fast-XML-Parser: before 5.7.0 (fixed in 5.7.0)

Published 2026-05-07. Last modified 2026-06-17.