CVE-2026-44664 MEDIUM

CVE-2026-44664: fast-xml-builder: Comment Value bypass regex

Vendor Naturalintelligence
Product fast-xml-builder
Weakness CWE-91 · XML injection
Published May 13, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

fast-xml-builder builds XML from JSON. In 1.1.5, the fix for CVE-2026-41650 in fast-xml-parser sanitizes -- sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->...), allowing an attacker to break out of an XML comment and inject arbitrary XML/HTML content. This vulnerability is fixed in 1.1.6.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
May 13, 2026 Record updated