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DEBIAN-CVE-2026-58253

Type: advisorySource: OSV1 source record

NATS 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_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-58253

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-58253

nats-server

Source reference: /affected/0/package/name

Affected versions
2.10.1-1

Source reference: /affected/0/versions

2.10.16-1

Source reference: /affected/0/versions

2.10.18-1

Source reference: /affected/0/versions

2.10.24-1

Source reference: /affected/0/versions

2.10.27-1

Source reference: /affected/0/versions

2.10.3-1

Source reference: /affected/0/versions

2.10.4-1

Source reference: /affected/0/versions

2.10.7-1

Source reference: /affected/0/versions

2.12.4-1

Source reference: /affected/0/versions

2.12.6-1

Source reference: /affected/0/versions

2.14.1-1

Source reference: /affected/0/versions

2.14.3-1

Source reference: /affected/0/versions

2.14.6-1

Source reference: /affected/0/versions

2.9.10-1

Source reference: /affected/0/versions

2.9.19-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nats-server

Source reference: /affected/1/package/name

Affected versions
2.10.27-1

Source reference: /affected/1/versions

2.12.4-1

Source reference: /affected/1/versions

2.12.6-1

Source reference: /affected/1/versions

2.14.1-1

Source reference: /affected/1/versions

2.14.3-1

Source reference: /affected/1/versions

2.14.6-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nats-server

Source reference: /affected/2/package/name

Affected versions
2.10.27-1

Source reference: /affected/2/versions

2.12.4-1

Source reference: /affected/2/versions

2.12.6-1

Source reference: /affected/2/versions

Fixed versions
2.14.1-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.10.1-1",
      "2.10.16-1",
      "2.10.18-1",
      "2.10.24-1",
      "2.10.27-1",
      "2.10.3-1",
      "2.10.4-1",
      "2.10.7-1",
      "2.12.4-1",
      "2.12.6-1",
      "2.14.1-1",
      "2.14.3-1",
      "2.14.6-1",
      "2.9.10-1",
      "2.9.19-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58253.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.10.27-1",
      "2.12.4-1",
      "2.12.6-1",
      "2.14.1-1",
      "2.14.3-1",
      "2.14.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58253.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.14.1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.10.27-1",
      "2.12.4-1",
      "2.12.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58253.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57992 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement