CVE-2026-58251: Linuxfoundation Nats-Server

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Affected products

• Linuxfoundation Nats-Server: before 2.11.16 (fixed in 2.11.16); from 2.12.0, before 2.12.7 (fixed in 2.12.7)

Published 2026-07-08. Last modified 2026-07-13.