CVE-2026-25128: fast-xml-parser has RangeError DoS Numeric Entities Bug
NaturalIntelligence · fast-xml-parser
Affected: NaturalIntelligence fast-xml-parser · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 49% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- NaturalIntelligence · fast-xml-parser>= 5.0.9, <= 5.3.3
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- NaturalIntelligence
- Published
- January 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-25128 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.