{
  "cveId": "CVE-2026-58253",
  "url": "https://patchblox.com/security/cve/CVE-2026-58253",
  "summary": "CVE-2026-58253 is fixed in nats-server on 1 platform by DEBIAN-CVE-2026-58253 (version 2.14.1-1), released July 4, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "NATS Server: Route API Auth Bypass",
  "description": "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.",
  "published": "2026-07-08T20:16:54Z",
  "severity": "Important",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L",
  "cwe": "Improper Authentication",
  "epss": 0.00368,
  "epssPercentile": 0.30909,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58253",
  "fixes": [
    {
      "platform": "linux",
      "product": "nats-server",
      "release": "Debian 14",
      "fixedVersion": "2.14.1-1",
      "fix": "DEBIAN-CVE-2026-58253",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-58253",
      "released": "2026-07-04T15:03:22Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}