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

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

Entity encoding bypass via regex injection in DOCTYPE entity names Summary 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. Details The fix for CVE-2023-34104 addressed some regex metacharacters in entity names but missed . (period), which is valid in XML names per the W3C spec. In DocTypeReader.js, entity names are passed directly to RegExp(): entities[entityName] = { regx: RegExp(`&${entityName};`, "g"), val: val }; An entity named l...

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**[devsupporter 해설]**

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