CVE WatchJul 13, 2026

CVE-2026-58214

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 authentica

CVSS

4.3

Medium

EPSS

0.3%

p28

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 13, 2026 · CWE-863

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-182026-09-15

Technical 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, 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.

Official references

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