Critical Vulnerability in Node.js: Diagnostics Channel Event Hooking
Summary
CVE-2025-23083: With the aid of the diagnostics_channel utility, an event can be hooked into whenever a worker thread is created. Affects nodejs versions < 22.13.1-r0. Fixed in 22.13.1-r0. How to fix ↓
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Background
Node.js is a powerful JavaScript runtime built on Chrome's V8 engine, designed for building scalable network applications. It allows developers to use JavaScript on the server-side, enabling the creation of dynamic web applications. The diagnostics_channel utility in Node.js facilitates event-driven programming by allowing developers to hook into various events. However, a vulnerability has been identified that exposes internal worker threads, potentially allowing malicious actors to exploit this functionality.
Vulnerability Detail
The vulnerability, identified as CVE-2025-23083, arises from the diagnostics_channel utility, which allows an event to be hooked whenever a worker thread is created. This exposure is not limited to user-created workers; it also includes internal workers, which can be fetched and manipulated. This could lead to unauthorized access and execution of malicious code, particularly affecting users who have enabled the Permission Model in Node.js versions 20, 22, and 23. The implications of this vulnerability are severe, as it can compromise the integrity and security of applications relying on Node.js.
How To Fix
Minimum fixed version
22.13.1-r0
This is the first release that contains the fix.
sudo apk add --upgrade nodejsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can disable the diagnostics_channel utility or avoid using the Permission Model until a patch is applied. This can be done by modifying the application code to refrain from utilizing these features until the vulnerability is resolved.
Conclusion
CVE-2025-23083 presents a significant risk to applications using Node.js, particularly those utilizing the diagnostics_channel utility and the Permission Model. It is crucial for developers to stay informed about this vulnerability and take necessary actions to mitigate risks by updating their Node.js installations or implementing workarounds.
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FAQ
CVE-2025-23083 is a vulnerability in Node.js that allows unauthorized access to internal worker threads through the diagnostics_channel utility.
Node.js versions 20, 22, and 23 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updates are not possible, consider disabling the diagnostics_channel utility or avoiding the use of the Permission Model as a temporary workaround.
More information can be found on the official CVE database or through security advisories related to Node.js.
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