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A critical vulnerability in Node.js TLS hostname handling allows embedded null characters in hostnames to cause silent authority rebinding due to C-string truncation in resolver bindings. This flaw affects multiple supported Node.js release lines including versions 22, 24, and 26, as well as specific Ubuntu package versions. The vulnerability can lead to incorrect hostname verification during TLS connections, potentially compromising confidentiality, integrity, and availability. A patch is available for the affected versions.

CVE-2026-48930 is a critical vulnerability in Node.js TLS hostname handling where embedded null characters in hostnames cause silent authority rebinding due to C-string truncation in resolver bindings. This results in incorrect hostname verification during TLS connections. The issue affects multiple supported Node.js release lines including versions 22, 24, and 26, as well as several Ubuntu package versions. The vulnerability has a CVSS score of 9.8, indicating a high impact on confidentiality, integrity, and availability. A patch is available for the affected versions.

Detailed information about A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string trunc

A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string truncation in… (CVE-2026-48930) - Live Threat Intelligence - Threat Radar | OffSeq.com

Nodejs: A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string truncation in… (CVE-2026-48930)

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