GitHub Advisoryadvisory · npm

GHSA-45c6-75p6-83cc fast-xml-builder Comment Value regex can be bypassed

MEDIUM Published 2026-05-08 Modified 2026-05-14 Official page ↗
Aliases
CVE-2026-44664
Ecosystem
npm
Packages
fast-xml-builder
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-91
Reviewed
2026-05-08

Affected packages

• npm fast-xml-builder: >= 1.1.5, < 1.1.6 → fixed in 1.1.6

Description

Summary The fix for https://github.com/advisories/GHSA-gh4j-gqv2-49f6 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. Impact Any application with comment property enabled allow attacker to inject malicious or unwanted code like JS script tag in the XML/HTML output. Workarounds Check for the presence of 3 consecutive dashes externally in the property value used for comment tag.

Related

Alias · CVE (1)

Weakness · CWE (1)

  • CWE-91 XML Injection weakness

References