fast-xml-parser has an entity encoding bypass via regex injection in DOCTYPE entity names

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

不正确的正则表达式

fast-xml-parser 安全漏洞

fast-xml-parser是Natural Intelligence开源的一个库。用于在没有基于 C/C++ 的库和回调的情况下，快速验证 XML、解析 XML 和构建 XML。 fast-xml-parser 4.1.3版本至5.3.5之前版本存在安全漏洞，该漏洞源于DOCTYPE实体名称中的点被当作正则表达式通配符处理，可能导致跨站脚本攻击。

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