CVE-2026-33217High· 7.1▾ TwilightNATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing M…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the $MQTT.> namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
nats-server < 2.11.15nats-server >= 2.12.0, < 2.12.6Upgrade past the affected range:
nats-server 2.12.6Connected by shared product, vendor, weakness, or advisory.
CVE-2026-33247High· 7.4NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33219Medium· 5.3NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33218High· 7.5NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33216High· 8.6NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-29785High· 7.5NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-27889High· 7.5NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system