CVE-2026-44665: Naturalintelligence Fast-XML-Builder

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

fast-xml-builder builds XML from JSON. Prior to 1.1.7, when an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML. This vulnerability is fixed in 1.1.7.

Affected products

• Naturalintelligence Fast-XML-Builder: before 1.1.7 (fixed in 1.1.7)

Published 2026-05-13. Last modified 2026-06-17.