CVE-2026-33216
HIGHDescription
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.
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 30% of all known CVEs.
References
Related Vulnerabilities
Other CWE-256 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-28736 | High | 7.1 | 2.5% | - | - |
| CVE-2019-10921 | High | 7.5 | 2.4% | - | Fix |
| CVE-2017-16714 | Critical | 9.8 | 2.4% | - | Fix |
| CVE-2024-26165 | High | 8.8 | 1.9% | - | Fix |
| CVE-2020-8183 | High | 7.5 | 1.9% | - | Fix |
| CVE-2020-6961 | Critical | 10.0 | 1.6% | - | - |
Common questions
How do I fix CVE-2026-33216?
Published advisories record a fix for 5 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-33216 being actively exploited?
Not that we know of. CVE-2026-33216 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 30% of all scored CVEs.
How severe is CVE-2026-33216?
CVE-2026-33216 has a CVSS v3 base score of 8.6, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-33216 affect?
Published advisories record a fix for nats-server (Debian), registry.redhat.io/multicluster-globalhub/multicluster-globalhub (Red Hat / RHEL), registry.redhat.io/multicluster-globalhub/multicluster-globalhub (Rocky), registry.redhat.io/multicluster-globalhub/multicluster-globalhub-postgres (Rocky), and 1 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-33216
Markdown
[](https://tridentstack.com/cve/CVE-2026-33216)HTML
<a href="https://tridentstack.com/cve/CVE-2026-33216"><img src="https://tridentstack.com/cve/badge/CVE-2026-33216.svg" alt="CVE-2026-33216"></a>Check your Linux endpoints for this class of vulnerability
TridentStack Control continuously scans Linux endpoints for known vulnerabilities and deploys the fixes from the same console. 200 endpoints free forever, no credit card.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-09.