| Package | Affected versions | Patched versions |
|---|---|---|
| nats-server | ≥ 2.14.0, < 2.14.3< 2.12.12 | 2.14.32.12.12 |
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.
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