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CVE-2026-33247

7.4 · HIGH

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

Published Mar 25, 2026CWE-215EPSS 0.54%

Overview

CVE-2026-33247 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, 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, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refadvisories.nats.io/CVE/secnote-2026-14.txtGitHubgithub.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvvRefaccess.redhat.com/errata/RHSA-2026:21769Refaccess.redhat.com/errata/RHSA-2026:22347Refaccess.redhat.com/errata/RHSA-2026:23345Refaccess.redhat.com/security/cve/CVE-2026-33247Refbugzilla.redhat.com/show_bug.cgi?id=2451486Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33247.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33247?

CVE-2026-33247 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-33247?

This vulnerability has a CVSS 3.1 base score of 7.4, 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-2026-33247?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2026-33247?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33247 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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