VULNERABILITY INTELLIGENCE

CVE-2026-25896

CVSS score9.3 CRITICAL
EPSS probability0.53%
CISA KEVNot currently listed
Published2026-02-20
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Description

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.

Weakness classification

  • security-advisories@github.com: CWE-185
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-79

Primary references