Improper Authentication in nats-server - CVE-2026-33246
Published: April 22, 2026
Vulnerability identifier: #VU126863
CSH Severity: Medium
CVSS v4: 5.3 [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]
CVE-ID: CVE-2026-33246
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
nats-server
How to mitigate CVE-2026-33246
Install updates from vendor's website.
nats-server - addressed in versions 2.11.15, 2.12.6