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CVE-2026-33216

8.6 · HIGH

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system.

Published Mar 25, 2026linuxfoundationCWE-256EPSS 0.37%

Overview

CVE-2026-33216 is a high-severity vulnerability affecting linuxfoundation nats-server. It was published on March 25, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from linuxfoundation. Update nats-server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxfoundationnats-server>= 0, < 2.11.15Affected

References

Refadvisories.nats.io/CVE/secnote-2026-05.txtGitHubgithub.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099GitHubgithub.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mcRefaccess.redhat.com/errata/RHSA-2026:21769Refaccess.redhat.com/errata/RHSA-2026:22347Refaccess.redhat.com/errata/RHSA-2026:23345Refaccess.redhat.com/security/cve/CVE-2026-33216Refbugzilla.redhat.com/show_bug.cgi?id=2451448Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33216?

CVE-2026-33216 is a high-severity vulnerability affecting linuxfoundation nats-server. It was published on March 25, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-33216?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-33216?

Check the references section for vendor advisories and patches from linuxfoundation. Update nats-server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33216?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33216 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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