CVE-2026-106069

CVE Details

Release Date:	2026-10-23
Impact:	Important	What is this?

Description

A flaw in Node.js TLS hostname verification can cause a server certificate to be validated against a different IP address than the one the client connected to, when the host is a non-canonical IPv4 literal with a leading zero, such as `0127.0.0.1`. `tls.checkServerIdentity()` normalizes the host following the WHATWG URL rules, which read a leading-zero octet as octal (`0127.0.0.1` becomes `87.0.0.1`), while the connection is made through the operating system resolver, which on some platforms such as macOS reads it as decimal (`127.0.0.1`). A server at the connected address can then be authenticated with a certificate issued for another IP address. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.

See more information about CVE-2026-106069 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.4
Vector String:	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Version:	3.1
Attack Vector:	Network
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (nodejs)	ELSA-2026-92376	2026-10-30
Oracle Linux version 8 (nodejs-nodemon)	ELSA-2026-92376	2026-10-30
Oracle Linux version 8 (nodejs-packaging)	ELSA-2026-92376	2026-10-30
Oracle Linux version 9 (nodejs)	ELSA-2026-92378	2026-10-30
Oracle Linux version 9 (nodejs-nodemon)	ELSA-2026-92378	2026-10-30
Oracle Linux version 9 (nodejs-packaging)	ELSA-2026-92378	2026-10-30