#VU124541 Path manipulation in Node.js - CVE-2026-21637
Published: March 25, 2026 / Updated: April 17, 2026
Vulnerability identifier: #VU124541
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-21637
CWE-ID: CWE-249
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Node.js
Node.js
Software vendor:
Node.js Foundation
Node.js Foundation
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper error handling in _tls_wrap.js when processing TLS SNI handshake requests. A remote attacker can send a specially crafted request with unexpected servername input to cause an uncaught exception, crashing the Node.js process.
Exploitation occurs during TLS handshake when SNICallback is configured and throws synchronously.
Remediation
Install security update from vendor's website.