Node.js TLS Hostname Normalization Bypass via Unicode Dot Separator
CVE-2026-48618 Published on June 26, 2026

A flaw in Node.js TLS hostname handling can cause Node.js unicode dot separator handling can lead to tls wildcard-depth authentication bypass due to resolver and verifier hostname normalization mismat. This can lead to confidentiality impact or bypass of the intended security boundary under affected configurations. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

NVD

Vulnerability Analysis

CVE-2026-48618 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Types

Improper Handling of Unicode Encoding

The software does not properly handle when an input contains Unicode encoding.

Authentication Bypass by Alternate Name

The software performs authentication based on the name of a resource being accessed, or the name of the actor performing the access, but it does not properly check all possible names for that resource or actor.


Products Associated with CVE-2026-48618

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Red Hat Enterprise Linux (RHEL)
 
Red Hat Enterprise Linux Eus
 
Red Hat Hummingbird
 

Affected Versions

nodejs node: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10.0 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: