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XML Injection (aka Blind XPath Injection) in fast-xml-parser

CVE-2026-41650

  • fast-xml-parser
  • org.webjars.npm:fast-xml-parser
Medium
6.1/10

Summary

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.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • NONE
  • LOW
  • NONE

CWE-91 - XML Injection (aka Blind XPath Injection)

The software does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system.

References

Advisory Timeline

  • Published