Main Vulnerability Database Vulnerabilities #VU126863

Improper Authentication in nats-server - CVE-2026-33246

Published: April 22, 2026

Vulnerability identifier: #VU126863

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2026-33246

CWE-ID: CWE-287

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: NATS - The Cloud Native Messaging System

Affected software:
nats-server

Detailed vulnerability description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to improper authentication within leafnode connections. A remote user can spoof the Nats-Request-Info identity headers.

Install updates from vendor's website.