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CVE-2026-33216

Linuxfoundation Nats-server vulnerability

8.6 HIGHEPSS 0.63%
  1. Published25 Mar 2026

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, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Linuxfoundation Nats-server≥ 2.12.0 < 2.12.6 · < 2.11.15

Remediation

Fixed in
Linuxfoundation Nats-server≥ 2.12.6

References

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Frequently asked

Is CVE-2026-33216 being actively exploited?

CVE-2026-33216 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.63%.

How severe is CVE-2026-33216?

CVE-2026-33216 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2026-33216?

Affected products include Linuxfoundation Nats-server.

How do I fix CVE-2026-33216?

Upgrade affected software to a fixed version, for example Linuxfoundation Nats-server 2.12.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33216 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.