SB20260420116 - Input validation error in fast-xml-parser
Published: April 20, 2026
Security Bulletin ID
SB20260420116
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2026-27942)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in arrToStr in XMLBuilder when processing input with preserveOrder enabled. A remote user can supply specially crafted input to cause a denial of service.
Only applications using the XML builder with preserveOrder set to true are vulnerable.
Remediation
Install update from vendor's website.