CVE-2026-58214

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-863: Incorrect Authorization

Product status

References

github.com/...server/security/advisories/GHSA-4g68-3pwx-5vfj

github.com/...ommit/297b166be60fe13144084eed4b25201ead03204a

github.com/...ommit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97

github.com/nats-io/nats-server/releases/tag/v2.12.12

github.com/nats-io/nats-server/releases/tag/v2.14.3

cve.org (CVE-2026-58214)

nvd.nist.gov (CVE-2026-58214)

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