CVE-2026-25896

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.

Score
CVSS 3.1 9.3 Critical
Status
Modified - security-advisories@github.com
Published
2026-02-20
Last modified
2026-09-10
Weaknesses
CWE-185, CWE-79

Affected products

References

 
 
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