CVE-2026-58251
NATS Server: Queue Subscribe Authz Bypass
6.5
MEDIUM
CVSS 3.1
EPSS 0.46%
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.
How to fix CVE-2026-58251
To remediate CVE-2026-58251, upgrade the affected package to a fixed version below.
- —upgrade to 2.11.16 or later
Is CVE-2026-58251 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.11.16, >= 2.12.0, < 2.12.7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |