7.5

CVE-2026-25128: naturalintelligence fast-xml-parser Improper Input Validation

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-25128CGA-2rx4-3prr-f878CGA-4xcx-ppf2-8hvm
Published 30-01-2026Last modified 11-02-2026
Open JSON

Vulnerability summary

CVE-2026-25128 is a high (CVSS 7.5) Improper Input Validation vulnerability in naturalintelligence fast-xml-parser. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.62%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:11126-1CGA-6FX2-CVG4-R922

Timeline

  1. 30-01-2026
    PublishedVulnerability first disclosed.
  2. 11-02-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

+0.04 pp

From 0.58% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Fast Xml Parser

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard33 products
  • dbgate< 7.0.0-r1
  • dbgate-fips< 7.0.1-r0
  • jitsucom-jitsu-console< 2.11.0-r14
  • kibana-8.17< 8.17.10-r8
  • kibana-8.17-iamguarded< 8.17.10-r8
Wolfi9 products
  • jitsucom-jitsu-console< 2.11.0-r14
  • kubeflow-pipelines-frontend< 2.15.0-r7 | < 2.15.0-r10
  • langfuse-3< 3.150.0-r0
  • langfuse-3-worker< 3.153.0-r2 | < 3.150.0-r0
  • opensearch-dashboards-3< 3.4.0-r3 | < 3.4.0-r2
Naturalintelligence1 product
Npm1 product
  • fast-xml-parser≥ 5.0.9, < 5.3.4
Ubuntu1 product
  • node-webfontAll versions (No fix recorded)

5 vendors · 45 products

References

8 links