{
  "cveId": "CVE-2026-58209",
  "url": "https://patchblox.com/security/cve/CVE-2026-58209",
  "summary": "CVE-2026-58209 is fixed in nats-server on 1 platform by DEBIAN-CVE-2026-58209 (version 2.14.3-1), released July 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "NATS Server: MQTT retained and QoS replay bypass subscribe deny filters",
  "description": "NATS 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, MQTT retained message delivery and QoS1\u002B durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.",
  "published": "2026-07-08T20:16:53Z",
  "severity": "Moderate",
  "cvss": 4.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
  "cwe": "Incorrect Authorization",
  "epss": 0.00342,
  "epssPercentile": 0.27912,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58209",
  "fixes": [
    {
      "platform": "linux",
      "product": "nats-server",
      "release": "Debian 14",
      "fixedVersion": "2.14.3-1",
      "fix": "DEBIAN-CVE-2026-58209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-58209",
      "released": "2026-07-06T15:20:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}