Is CVE-2026-33217 actively exploited?

No active exploitation of CVE-2026-33217 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33217 be exploited remotely?

Yes. CVE-2026-33217 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33217?

CVE-2026-33217 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-33217

CWE-863Published: March 25, 2026· Updated: Mar 26, 2026

6.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:6.5th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-33217 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.