TLS Error Handling Vulnerability in Node.js Affecting Remote Servers

CVE-2026-21637

What is CVE-2026-21637?

A vulnerability in Node.js's handling of TLS errors exposes servers to potential denial of service attacks. This flaw allows remote attackers to exploit vulnerabilities in TLS server implementations using PSK (Pre-Shared Key) or ALPN (Application-Layer Protocol Negotiation) callbacks. During these callbacks, exceptions that are not properly managed can either terminate the process abruptly or lead to unnoticed file descriptor leaks. As these callbacks can handle input directed by an attacker during the TLS handshake, it permits continuous triggering of the flaw, which can exhaust server resources and lead to unavailability. This issue underscores the critical need for secure coding practices in managing TLS error handling in Node.js applications.

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