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OpenAdvisories
Medium · 6.5 CVE-2026-58251 EUVD-2026-42369

NATS Server: Queue Subscribe Authz Bypass

Published Jul 8, 2026 · Updated Jul 9, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
nats-io nats-server < 2.11.16, >= 2.12.0-RC.1, < 2.12.7 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 nats-server 2.14.1-1 —
Debian 13 nats-server No fix yet —
Debian 12 nats-server No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 25.10 nats-server No fix yet —
Ubuntu 24.04 LTS nats-server No fix yet —
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 26.04 LTS nats-server No fix yet —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 telegraf 1.31.0-27 —

Advisories 1

References