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NATS credentials are exposed in monitoring port via command-line argv

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-33247
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:04 UTC · Revision 1

Source evidence

NATS credentials are exposed in monitoring port via command-line argv

core-osv · Original source

Published 25 Mar 2026, 20:02 UTC

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.

osv:CVE-2026-33247
Complete source record
{
  "id": "f00e8003be50c39c6cf82fdb8b0af0eaaea1f03fdc584b254ab17a2b780cbd4e",
  "url": "https://osv.dev/vulnerability/CVE-2026-33247",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NATS credentials are exposed in monitoring port via command-line argv",
    "summary": "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.",
    "evidence": "osv:CVE-2026-33247",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-33247",
      "aliases": [
        "BIT-nats-2026-33247",
        "CVE-2026-33247",
        "GHSA-x6g4-f6q3-fqvv",
        "GO-2026-4827"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
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              "type": "GIT",
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                  "introduced": "0"
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                {
                  "fixed": "bef17e1d9de6574fae0eabe1798db0d4529834e4"
                },
                {
                  "introduced": "fc6ec648d806652d282d2f0edb6cb9f22c895572"
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                {
                  "fixed": "0e0639058e0d2d8fce0cc34941f9897da152ab32"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
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                        "introduced": "0"
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                      {
                        "fixed": "2.11.15"
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                    "source": "CPE_RANGE"
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                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
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                        "introduced": "2.12.0"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33247.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.338062422Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33247.json",
        "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://advisories.nats.io/CVE/secnote-2026-14.txt",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33247.json",
        "https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33247",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2451486"
      ],
      "provider_metadata": {
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33247.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33247",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508904,
  "published_at": "2026-03-25T20:02:18.868+00:00"
}