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High severityOSV Advisory· Published Jan 30, 2026· Updated Feb 11, 2026

fast-xml-parser has RangeError DoS Numeric Entities Bug

CVE-2026-25128

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. 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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
fast-xml-parsernpm
>= 5.0.9, < 5.3.45.3.4

Affected products

43

Patches

Vulnerability mechanics

References

5

News mentions

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