CVEvulnerability

CVE-2026-25896

9.3 CRITICAL Published 2026-02-20 Modified 2026-09-10 Official page ↗
Status
Modified
Published
2026-02-20
Last modified
2026-09-10
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.3 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Weaknesses
CWE-185, CWE-79

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.

Affected configurations

• naturalintelligence fast-xml-parser (>= 4.1.3 < 5.3.5)

Related

Weakness · CWE (2)

  • CWE-185 Incorrect Regular Expression weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References