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CVE-2026-27942

LOW CVSS 4.0: 2.7 EPSS 0.05%
Updated Feb 26, 2026
fast-xml-parser
Parameter Value
CVSS 2.7 (LOW)
Type CWE-120 (Buffer Copy without Checking Size)
Vendor fast-xml-parser
Public PoC No

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. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with `preserveOrder:true`. Version 5.3.8 fixes the issue.

As a workaround, use XML builder with `preserveOrder:false` or check the input data before passing to builder.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v4.0