Skip to main content
HIGH

CVE-2026-25128

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-16

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for fast-xml-parser. Watch fast-xml-parser in CVE Watch Free account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • fast-xml-parsernpmfrom 5.0.9 · fixed in 5.3.4

Vendor advisories

  • CVE-2026-25128 Red Hat Product Security243 products fixed · 12 known affected

    fast-xml-parser: fast-xml-parser has RangeError DoS Numeric Entities Bug

    mta/mta-ui-rhel9 as a component of Migration Toolkit for Applications 8 · advanced-cluster-security/rhacs-central-db-rhel8 as a component of Red Hat Advanced Cluster Security 4 · advanced-cluster-security/rhacs-rhel8-operator as a component of Red Hat Advanced Cluster Security 4

  • RHSA-2026:51349 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-frontend-rhel9 container image

  • RHSA-2026:41944 Red Hat Product Security78 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.20 security, enhancement & bug fix update

  • RHSA-2026:40984 Red Hat Product Security88 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.20.15 security, enhancement & bug fix update

  • RHSA-2026:26420 Red Hat Product Security68 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.24 security, enhancement & bug fix update

  • RHSA-2026:7128 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHACS 4.9.5 security and bug fix update

1 more advisory

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-01-30
Last Modified
2026-02-27

Frequently asked questions

What is 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. 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.

Is CVE-2026-25128 actively exploited?

Active exploitation of CVE-2026-25128 has not been confirmed. Its EPSS score was 0.6% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-25128?

CVE-2026-25128 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running fast-xml-parser? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · 50 free checks/month · Free API key

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database