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Vulnerability record · CVE-2026-33247 · published 25 March 2026

CVE-2026-33247: Linuxfoundation nats-server vulnerability

Linuxfoundation · Nats Server

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.

5.3 CVSS 3.1 Medium EPSS 0.54% · top 56.9% CWE-215 · CWE-215CWE-214 · CWE-214
5.3CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://advisories.nats.io/CVE/secnote-2026-14.txt MitigationVendor Advisory
https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv MitigationVendor Advisory
https://access.redhat.com/errata/RHSA-2026:21769
https://access.redhat.com/errata/RHSA-2026:22347
https://access.redhat.com/errata/RHSA-2026:23345
https://access.redhat.com/security/cve/CVE-2026-33247
https://bugzilla.redhat.com/show_bug.cgi?id=2451486
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33247.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-28357Linuxfoundation nats-server path traversal vulnerabilityNATS nats-server 2.2.0 through 2.7.4 allows directory traversal because of an unintended path to a management action from a management account.EPSS 1.2%9.8CVE-2020-26892Linuxfoundation nats-server hard-coded credentials vulnerabilityThe JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of how expired credentials are handled.EPSS 2.1%8.8CVE-2026-58253Linuxfoundation nats-server improper authentication vulnerabilityNATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_…EPSS 0.37%8.8CVE-2022-24450Linuxfoundation nats-server missing authorization vulnerabilityNATS nats-server before 2.7.2 has Incorrect Access Control. Any authenticated user can obtain the privileges of the System account by misusing the "d…EPSS 1.3%7.5CVE-2026-58208Linuxfoundation nats-server vulnerabilityNATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener c…EPSS 0.60%7.5CVE-2026-58250Linuxfoundation nats-server null pointer dereference vulnerabilityNATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated pee…EPSS 0.74%7.5CVE-2026-58210Linuxfoundation nats-server uncontrolled resource consumption vulnerabilityNATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQT…EPSS 0.74%7.5CVE-2026-33216Linuxfoundation nats-server vulnerabilityNATS-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 deploy…EPSS 0.63%

Source: NIST National Vulnerability Database (record CVE-2026-33247), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.