CVE-2026-58252
NATS Server: Subscribe Authz Bypass via Wildcard-Overlap
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 could receive messages on denied subjects when a wildcard subscription overlapped with a configured wildcard deny rule but was not a subset of it, and queue subscriptions could also affect delivery to legitimate queue consumers. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
How to fix CVE-2026-58252
To remediate CVE-2026-58252, upgrade the affected package to a fixed version below.
- —upgrade to 2.11.16 or later
Is CVE-2026-58252 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 |