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

CVE-2026-25128 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Fast Xml Parser are affected by CVE-2026-25128?

A high-severity vulnerability in fast-xml-parser (CVE-2026-25128) poses a significant risk to any organization using this library for XML processing.. A patch is available.

Is there a public PoC exploit available for CVE-2026-25128?

Yes, a public proof-of-concept exploit is available for CVE-2026-25128. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-25128?

Within 24 hours: Identify all applications and systems using fast-xml-parser and document their versions and deployment locations. Within 7 days: Apply the available vendor patch to all affected systems, prioritizing production environments and customer-facing applications. Within 30 days: Conduct a retrospective security audit to verify patch deployment completion and implement automated dependency scanning to detect similar vulnerabilities in the future.

Fast Xml Parser CVE-2026-25128

HIGH

Improper Input Validation (CWE-20)

2026-01-30 security-advisories@github.com

GHSA-37qj-frw5-hhjh

Denial Of Service Fast Xml Parser Red Hat Suse

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SUSE

HIGH

qualitative

Red Hat

5.3 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:00 vuln.today

PoC Detected

Feb 27, 2026 - 20:22 vuln.today

Public exploit code

Patch released

Feb 27, 2026 - 20:22 nvd

Patch available

CVE Published

Jan 30, 2026 - 16:16 nvd

HIGH 7.5

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

25 npm packages depend on fast-xml-parser (10 direct, 15 indirect)

Ecosystem-wide dependent count for version 5.0.9.

DescriptionGitHub Advisory

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., &#9999999; or &#xFFFFFF;). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issue.

AnalysisAI

Fast-xml-parser versions 5.0.9 through 5.3.3 crash when processing XML containing out-of-range numeric entity code points, allowing remote attackers to cause denial of service against applications parsing untrusted XML input. Public exploit code exists for this vulnerability. Applications should upgrade to version 5.3.4 or later to remediate.

Technical ContextAI

Classified as CWE-20 (Improper Input Validation). Affects Fast-Xml-Parser. 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., &#9999999; or &#xFFFFFF;). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issu

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

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Vendor StatusVendor

SUSE

Severity: High

Product	Status
SUSE Linux Enterprise Server 16.0	Fixed
SUSE Linux Enterprise Server 16.1	Fixed
SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
SUSE Linux Enterprise Server for SAP applications 16.1	Fixed

CVE-2026-25128 vulnerability details – vuln.today

Back

Fast Xml Parser CVE-2026-25128

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

Blast Radius

DescriptionGitHub Advisory

AnalysisAI

Technical ContextAI

RemediationAI

More in Fast Xml Parser

Same weakness CWE-20 – Improper Input Validation

Same technique Denial Of Service

Vendor StatusVendor

SUSE

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External POC / Exploit Code