Fast Xml Parser
CVE-2026-25128
HIGH
GHSA-37qj-frw5-hhjh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
Lifecycle Timeline
4Blast Radius
ecosystem impact- 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., � 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.
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | fast-xml-parser versions 5.0.9 through 5.3.3 parsing untrusted XML input containing numeric entity references with out-of-range code points (e.g., � or �) Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to validate XML, parse XML to JS object, or build XML from JS object without C/C++. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all applications and systems using fast-xml-parser and document their versions and deployment locations. …
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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 |
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External POC / Exploit Code
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