nats-server: NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system
CVE-2026-58214 is fixed in nats-server on 1 platform by DEBIAN-CVE-2026-58214 (version 2.14.3-1), released July 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nats-server · Debian 14 | 2.14.3-1 | DEBIAN-CVE-2026-58214 | Jul 6, 2026 |
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