CVE-2026-27942

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-27942
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.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a Patch
https://github.com/NaturalIntelligence/fast-xml-parser/pull/791 Issue Tracking Patch
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-fj3w-jwp8-x2g3 Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*
cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*
History

02 Mar 2026, 14:54

Type Values Removed Values Added
CPE cpe:2.3:a:fast-xml-parser_project:fast-xml-parser:*:*:*:*:*:node.js:*:* cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*
First Time Naturalintelligence
Naturalintelligence fast-xml-parser

27 Feb 2026, 17:14

Type Values Removed Values Added
References () https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a - () https://github.com/NaturalIntelligence/fast-xml-parser/commit/c13a961910f14986295dd28484eee830fa1a0e8a - Patch
References () https://github.com/NaturalIntelligence/fast-xml-parser/pull/791 - () https://github.com/NaturalIntelligence/fast-xml-parser/pull/791 - Issue Tracking, Patch
References () https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-fj3w-jwp8-x2g3 - () https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-fj3w-jwp8-x2g3 - Vendor Advisory
First Time Fast-xml-parser Project
Fast-xml-parser Project fast-xml-parser
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5
CPE cpe:2.3:a:fast-xml-parser_project:fast-xml-parser:*:*:*:*:*:node.js:*:*

26 Feb 2026, 02:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-26 02:16

Updated : 2026-03-02 14:54

NVD link : CVE-2026-27942

Mitre link : CVE-2026-27942

CVE.ORG link : CVE-2026-27942

JSON object : View

Products Affected

naturalintelligence

  • fast-xml-parser
CWE
CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')