CVE-2026-25128

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 parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issue.

The following products are affected by CVE-2026-25128 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-25128.

URL	Resource
https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc
https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh
https://nvd.nist.gov/vuln/detail/CVE-2026-25128
https://www.cve.org/CVERecord?id=CVE-2026-25128