Input validation error in fast-xml-builder - CVE-2026-44664
Published: May 7, 2026 / Updated: July 28, 2026
Vulnerability identifier: #VU139890
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-44664
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Natural Intelligence
Affected software:
fast-xml-builder
fast-xml-builder
Detailed vulnerability description
The vulnerability allows a remote attacker to inject arbitrary XML or HTML content.
The vulnerability exists due to improper input validation in XML comment content sanitization when processing comment property values. A remote attacker can supply a value containing three consecutive dashes to inject arbitrary XML or HTML content.
Only applications with the comment property enabled are vulnerable.
How to mitigate CVE-2026-44664
Install security update from vendor's website.