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 4.3.6 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.
History

Sat, 31 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 30 Jan 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 30 Jan 2026 15:30:00 +0000

Type Values Removed Values Added
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 4.3.6 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.
Title fast-xml-parser has RangeError DoS Numeric Entities Bug
Weaknesses CWE-20
CWE-248
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-01-30T15:14:58.244Z

Updated: 2026-01-30T15:40:55.259Z

Reserved: 2026-01-29T14:03:42.540Z

Link: CVE-2026-25128

cve-icon Vulnrichment

Updated: 2026-01-30T15:40:48.124Z

cve-icon NVD

Status : Received

Published: 2026-01-30T16:16:14.123

Modified: 2026-01-30T16:16:14.123

Link: CVE-2026-25128

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-30T15:14:58Z

Links: CVE-2026-25128 - Bugzilla