CVE-2026-25128
published 2026-01-30CVE-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…
PriorityP345high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.56%
42.9th percentile
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
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | node-webfont | — | — |
| naturalintelligence | fast-xml-parser | — | — |
| naturalintelligence | fast-xml-parser | >= 5.0.9 < 5.3.4 | 5.3.4 |
| naturalintelligence | fast-xml-parser | >= 5.0.9 < 5.3.4 | 5.3.4 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH
vendor_debian7.5LOW
vendor_redhat7.5HIGH
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OSV
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
osv·2026-01-30·CVSS 7.5
CVE-2026-25128 [HIGH] 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
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.
OSV
fast-xml-parser has RangeError DoS Numeric Entities Bug
osv·2026-01-30
CVE-2026-25128 [HIGH] fast-xml-parser has RangeError DoS Numeric Entities Bug
fast-xml-parser has RangeError DoS Numeric Entities Bug
### Summary
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.
### Details
The vulnerability exists in `/src/xmlparser/OrderedObjParser.js` at lines 44-45:
```javascript
"num_dec": { regex: /&#([0-9]{1,7});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 10)) },
"num_hex": { regex: /&#x([0-9a-fA-F]{1,6});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 16)) },
```
The `String.fromCodePoint()` method throws a `RangeError` when the code point exceeds the valid Unicode range (0 to 0x
GHSA
fast-xml-parser has RangeError DoS Numeric Entities Bug
ghsa·2026-01-30
CVE-2026-25128 [HIGH] CWE-20 fast-xml-parser has RangeError DoS Numeric Entities Bug
fast-xml-parser has RangeError DoS Numeric Entities Bug
### Summary
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.
### Details
The vulnerability exists in `/src/xmlparser/OrderedObjParser.js` at lines 44-45:
```javascript
"num_dec": { regex: /&#([0-9]{1,7});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 10)) },
"num_hex": { regex: /&#x([0-9a-fA-F]{1,6});/g, val : (_, str) => String.fromCodePoint(Number.parseInt(str, 16)) },
```
The `String.fromCodePoint()` method throws a `RangeError` when the code point exceeds the valid Unicode range (0 to 0x
Red Hat
fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
vendor_redhat·2026-01-30·CVSS 7.5
CVE-2026-25128 [HIGH] CWE-248 fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
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.
A denial of service flaw has been discovered in the fast-xml-parser npm library. In fast-xml-parser, a RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points
Debian
CVE-2026-25128: node-webfont - fast-xml-parser allows users to validate XML, parse XML to JS object, or build X...
vendor_debian·2026·CVSS 7.5
CVE-2026-25128 [HIGH] CVE-2026-25128: node-webfont - fast-xml-parser allows users to validate XML, parse XML to JS object, or build X...
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.
Scope: local
bookworm: resolved
forky: resolved
sid: resolved
trixie: resolved
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-25128 h3: fast-xml-parser has RangeError DoS Numeric Entities Bug [fedora-42]
bugzilla·2026-01-30·CVSS 7.5
CVE-2026-25128 [HIGH] CVE-2026-25128 h3: fast-xml-parser has RangeError DoS Numeric Entities Bug [fedora-42]
CVE-2026-25128 h3: fast-xml-parser has RangeError DoS Numeric Entities Bug [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, change the
Bugzilla
CVE-2026-25128 fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
bugzilla·2026-01-30·CVSS 7.5
CVE-2026-25128 [HIGH] CVE-2026-25128 fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
CVE-2026-25128 fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug
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.
Wiz
CVE-2026-25128 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.5
CVE-2026-25128 [HIGH] CVE-2026-25128 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-25128 :
JavaScript vulnerability analysis and mitigation
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Source : NVD
## 7.5
Score
Published January 30, 2026
Severity HIGH
CNA Score 7.5
Affected Technologies
JavaScript
Wolfi
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 22.3
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
kibana-9.0
langfuse-2
Sources
NVD
Chainguard Has Fix Added at: Feb 04, 2026
npm Severity HIGH Has Fix Added at: Jan 31, 2026
MinimOS Severity HIGH Has Fix Added at: Mar 02, 2026
Wolfi Has Fix Added at: Feb 04, 2026
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## Relat
2026-01-30
Published