CVE catalog

CVE-2026-33247

NATS-Server is a High-Performance server for NATS.io…

[CVE catalog]

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.

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.43% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "nats-server",
      "status": "fixed",
      "release": "sid",
      "version": "2.15.1-1"
    },
    {
      "name": "nats-server",
      "status": "fixed",
      "release": "forky",
      "version": "2.15.1-1"
    },
    {
      "name": "nats-server",
      "status": "vulnerable",
      "release": "trixie",
      "version": "2.10.27-1"
    },
    {
      "name": "nats-server",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "2.9.10-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "nats-server",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.12.6-1"
    },
    {
      "bug": null,
      "name": "nats-server",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.12.6-1"
    },
    {
      "bug": null,
      "name": "nats-server",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "nats-server",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "github.com/nats-io/nats-server/v2",
      "ecosystem": "go",
      "fixed_version": "2.11.15"
    },
    {
      "name": "github.com/nats-io/nats-server/v2",
      "ecosystem": "go",
      "fixed_version": "2.12.6"
    },
    {
      "name": "nats-server",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "nats-server",
      "ecosystem": "cpe",
      "fixed_version": "2.11.15"
    },
    {
      "name": "nats-server",
      "ecosystem": "cpe",
      "fixed_version": "2.12.6"
    },
    {
      "name": "nats-server",
      "ranges": [
        {
          "fixed": "2.12.6",
          "introduced": "2.12.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "2.12.6",
      "provider_record_id": "NVD-CVE-2026-33247"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [golang-github-nats-io-nats-server-dev]Unknown

    Source package: [nats-server]

    Details (2)

    • 2.9.10-1 · all · bookworm

      Affected

      nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12

    • 2.9.10-1 · all · bookworm

      Affected

      nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12

  • [nats-server]Unknown

    Source package: [nats-server]

    Details (2)

    • 2.9.10-1+b3 · amd64 · bookworm

      Affected

      nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12

    • 2.9.10-1+b3 · arm64 · bookworm

      Affected

      nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12

[Debian 13 (Trixie)]

  • [golang-github-nats-io-nats-server-dev]Unknown

    Source package: [nats-server]

    Details (2)

    • 2.10.27-1 · all · trixie

      Affected

      nvd · nats-server · debian · 13

    • 2.10.27-1 · all · trixie

      Affected

      nvd · nats-server · debian · 13

  • [nats-server]Unknown

    Source package: [nats-server]

    Details (2)

    • 2.10.27-1+b2 · amd64 · trixie

      Affected

      nvd · nats-server · debian · 13

    • 2.10.27-1+b2 · arm64 · trixie

      Affected

      nvd · nats-server · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]