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CVE-2026-58214

4.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 3

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 4.3 · linuxfoundationNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

References 5