CVE-2026-44664CWE-91

fast-xml-builder: Comment Value bypass regex

Medium · published May 13, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
15.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00253 · 15.9th percentile
Weakness
CWE-91 · XML Injection (aka Blind XPath Injection)
Published
2026-05-13T15:27Z
EPSS history
Timeline
  • 13 MAY 15:27Z
    fast-xml-builder: Comment Value bypass regex
    cvelistv5