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6.5 Medium

CVE-2026-58251 NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system

Description

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 and versions

Product Affected versions Fixed in
nats-server 2.12 2.12.0-RC.1 → < 2.12.7 2.12.7
nats-server 2.11 earliest → < 2.11.16 2.11.16

References

Timeline

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The 27 CVEs of nats-server →
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