CVE WatchSep 10, 2026

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 callb

CVSS

9.3

Critical

EPSS

0.5%

p39

KEV

—

Exploit Today

0-100

Published: Feb 20, 2026 · Last modified: Sep 10, 2026 · CWE-185 · CWE-79

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-08-132026-09-09

Technical 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.

Official references

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