{
  "cveId": "CVE-2026-40209",
  "url": "https://patchblox.com/security/cve/CVE-2026-40209",
  "summary": "CVE-2026-40209 is fixed in dnsdist on 1 platform, first by DEBIAN-CVE-2026-40209, released June 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "dnsdist: An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of...",
  "description": "An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.",
  "published": "2026-06-25T13:16:39Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "epss": 0.007,
  "epssPercentile": 0.53424,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dnsdist",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.9.15-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-40209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40209",
      "released": "2026-06-26T17:32:29Z"
    },
    {
      "platform": "linux",
      "product": "dnsdist",
      "release": "Debian 14",
      "fixedVersion": "2.1.0-1",
      "fix": "DEBIAN-CVE-2026-40209",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40209",
      "released": "2026-06-26T17:32:29Z"
    },
    {
      "platform": "linux",
      "product": "dnsdist",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.9.15-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21533-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21533-1",
      "released": "2026-08-05T09:13:07Z"
    },
    {
      "platform": "linux",
      "product": "dnsdist",
      "release": "sles 16.0",
      "fixedVersion": "1.9.15-160000.1.1",
      "fix": "SUSE-SU-2026:23146-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23146-1",
      "released": "2026-08-05T09:14:01Z"
    }
  ],
  "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"
  }
}