Naturalintelligence Fast-Xml-Parser vulnerabilities

CVE-2026-25896 [CRITICAL] CWE-185 CVE-2026-25896: fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object wi 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 val

CVE-2026-26278 [HIGH] CWE-776 CVE-2026-26278: fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object wi 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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes process

CVE-2026-25128 [HIGH] CWE-20 CVE-2026-25128: fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object wi 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. In versions 5.0.9 through 5.3.3, a RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points (e.g., `�` or `�`). This causes the

CVE-2026-33036 [HIGH] CVE-2026-33036: fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callback fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Versions 4.0.0-beta.3 through 5.5.5 contain a bypass vulnerability where numeric character references (&#NNN;, &#xHH;) and standard XML entities completely evade the entity expansion limits (e.g., maxTotalExpansions, maxExpandedLength) added to fix CVE-2026-

CVE-2026-27942 [HIGH] CWE-120 CVE-2026-27942: fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object wi 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. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with `preserveOrder:true`. Version 5.3.8 fixes the issue. As a workaround, use XML builder with `preserveOrder:fal

CVE-2023-34104 [HIGH] CWE-400 CVE-2023-34104: fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special charac fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for denial of service (DoS) attacks. By crafting an entity name t

CVE-2024-41818 [HIGH] CWE-400 CVE-2024-41818: fast-xml-parser is an open source, pure javascript xml parser. a ReDOS exists on currency.js. This v fast-xml-parser is an open source, pure javascript xml parser. a ReDOS exists on currency.js. This vulnerability is fixed in 4.4.1.

CVE-2023-26920 [MEDIUM] CWE-1321 fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name ### Impact As a part of this vulnerability, user was able to se code using `__proto__` as a tag or attribute name. ```js const { XMLParser, XMLBuilder, XMLValidator} = require("fast-xml-parser"); let XMLdata = "hacked" const parser = new XMLParser(); let jObj = parser.parse(XMLdata); console.log(jObj.

CVE-2026-33349 [MEDIUM] CWE-1284 CVE-2026-33349: fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callback fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From version 4.0.0-beta.3 to before version 5.5.7, the DocTypeReader in fast-xml-parser uses JavaScript truthy checks to evaluate maxEntityCount and maxEntitySize configuration limits. When a developer explicitly sets either limit to 0 — intending

CVE-2026-41650 [MEDIUM] CWE-91 CVE-2026-41650: fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callback fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "-->" sequence in comment content or the "]]>" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CD