CVE-2026-58254
NATS Server: Incomplete fix for CVE-2026-33249: Leaf node connections bypass Nats-Trace-Dest permission check
CVSS Score
0.0
EPSS Score
0.4%
EPSS Percentile
35th
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.
| CWE | CWE-863 |
| Vendor | nats-io |
| Product | nats-server |
| Published | Jul 8, 2026 |
| Last Updated | Jul 9, 2026 |
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Affected Versions
nats-io / nats-server
< 2.12.8 >= 2.14.0-RC.1, < 2.14.3
References
github.com: https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h github.com: https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd github.com: https://github.com/nats-io/nats-server/releases/tag/v2.12.8 github.com: https://github.com/nats-io/nats-server/releases/tag/v2.14.3