OpenJS Foundation Node.js up to 24.22.2/26.13.0 TLS Server Handshake server.addContext cross-domain policy

Summaryinfo

A vulnerability described as problematic has been identified in OpenJS Foundation Node.js up to 24.22.2/26.13.0. The affected element is the function server.addContext of the component TLS Server Handshake. Executing a manipulation can lead to cross-domain policy. This vulnerability appears as CVE-2026-126051. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OpenJS Foundation Node.js up to 24.22.2/26.13.0. It has been declared as problematic. This vulnerability affects the function server.addContext of the component TLS Server Handshake. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate. As an impact it is known to affect confidentiality. CVE summarizes:

A deferred-callback use-after-destroy in Node.js TLS server handshake handling allows a remote, unauthenticated attacker to terminate the server process. When a TLS server uses any of the SNICallback, OCSPRequest, newSession, or resumeSession hooks, or server.addContext(), the corresponding OpenSSL callbacks are deferred, and the deferred code does not handle the underlying socket being destroyed between scheduling and execution. By sending a client hello that reaches the vulnerable path (for example, no SNI together with an OCSP request) followed by padding and a socket FIN, an attacker makes OpenSSL deliver the client hello and the end-of-file in the same tick, so the socket is destroyed before the deferred callback runs and the process raises an uncaught exception instead of emitting an 'error' event. This vulnerability affects Node.js 26.x and 24.x.

The advisory is available at nodejs.org. This vulnerability was named CVE-2026-126051 since 11/10/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 24.22.3 or 26.13.1 eliminates this vulnerability.

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Productinfo

Type

• JavaScript Library

Vendor

• OpenJS Foundation

Name

• Node.js

Version

• 24.22.0
• 24.22.1
• 24.22.2
• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5
• 26.6
• 26.7
• 26.8
• 26.9
• 26.10
• 26.11
• 26.12
• 26.13.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒
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