CVE-2026-58214
Medium · 4.3CVSS
4.3
EPSS
0.3%
Published
Jul 8, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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