5.4
Medium
CVE-2026-58211 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 2.14.3 and 2.12.12, a client could be registered as the configured no_auth_user through a parser path used when the first client operation was not CONNECT, bypassing user-level connection restrictions such as allowed_connection_types or proxy_required that normal authentication would apply. This issue is fixed in versions 2.14.3 and 2.12.12.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| nats-server 2.14 | 2.14.0-RC.1 → < 2.14.3 | 2.14.3 |
| nats-server 2.12 | earliest → < 2.12.12 | 2.12.12 |
References
- github.com github.com
Timeline
- Published
- Last modified
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CVE-2026-58210
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CVE-2026-58209
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