{
  "cveId": "CVE-2026-97206",
  "url": "https://patchblox.com/security/cve/CVE-2026-97206",
  "summary": "CVE-2026-97206 is fixed in unbound on 1 platform, first by DEBIAN-CVE-2026-97206, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.",
  "description": "NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.",
  "published": "2026-10-21T09:17:08Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Use After Free",
  "epss": 0.00334,
  "epssPercentile": 0.26858,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97206",
  "fixes": [
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.2-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-97206",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97206",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.26.2-1",
      "fix": "DEBIAN-CVE-2026-97206",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97206",
      "released": "2026-10-24T13:25:57Z"
    }
  ],
  "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"
  }
}