CVE-2026-27571: nats-server websockets are vulnerable to pre-auth memory DoS

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Feb

Released

2026-02-27

EPSS Score

0.06% (percentile: 17.2%)

Affected Products (2)

Other

• 20782-17086
• 20797-17084

Revision History

• 2026-02-27: Information published.