Node.js Worker Thread Vulnerability in Diagnostics Channel Utility

CVE-2025-23083

What is CVE-2025-23083?

CVE-2025-23083 is a vulnerability found in the Node.js Worker Thread functionality, specifically impacting the diagnostics_channel utility. This component is crucial for efficient communication and coordination between different worker threads within Node.js applications. The vulnerability allows attackers, particularly those utilizing the permission model, to access internal worker instances and their constructors through event hooking. If exploited, it can lead to malicious usage, jeopardizing the integrity and security of organizations that rely on Node.js for their applications.

Technical Details

This vulnerability exploits the capabilities of the diagnostics_channel utility by allowing the hooking of events related to worker thread creation. It is particularly relevant for those operating under a permission model in Node.js versions 20, 22, and 23. The problem arises from the exposure of internal worker instances, which can be fetched and manipulated by unauthorized parties. The technical implications necessitate a thorough understanding of how worker threads operate within Node.js and the security protocols in place to safeguard their communications.

Potential impact of CVE-2025-23083

1. Unauthorized Access: The vulnerability could grant unauthorized users access to internal worker threads, allowing them to execute commands or manipulate data that should be secured, potentially leading to data breaches.

2. Malicious Code Execution: By exploiting this vulnerability, attackers can reinstate constructors of internal worker threads for unauthorized use, opening the door for executing malicious code that could compromise the system.

3. Increased Attack Surface: Organizations that utilize Node.js with the affected versions may face a broader attack surface, as the ability to manipulate worker threads can lead to further vulnerabilities and exploitations if not properly addressed.

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