{
  "cveId": "CVE-2026-123603",
  "url": "https://patchblox.com/security/cve/CVE-2026-123603",
  "summary": "CVE-2026-123603 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-123603, released November 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "rust-hickory-proto: hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-rec...",
  "description": "hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-recursor 0.25.0-alpha.3 through 0.26.0-alpha.1 fail to canonicalize IPv4-mapped IPv6 addresses when checking deny_answers, deny_server, or AccessControlSet rules. Attackers can use IPv4-mapped addresses to evade answer filtering, trigger queries to denied nameservers, or reach hickory-server library deployments on dual-stack IPv6 sockets from denied clients.",
  "published": "2026-11-08T02:16:55Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
  "epss": 0.00166,
  "epssPercentile": 0.05847,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "rust-hickory-proto",
      "release": "Debian 14",
      "fixedVersion": "0.26.3-1",
      "fix": "DEBIAN-CVE-2026-123603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-123603",
      "released": "2026-11-09T02:18:44Z"
    },
    {
      "platform": "linux",
      "product": "rust-hickory-resolver",
      "release": "Debian 14",
      "fixedVersion": "0.26.3-1",
      "fix": "DEBIAN-CVE-2026-123603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-123603",
      "released": "2026-11-09T02:18:44Z"
    },
    {
      "platform": "linux",
      "product": "rust-hickory-server",
      "release": "Debian 14",
      "fixedVersion": "0.26.3-1",
      "fix": "DEBIAN-CVE-2026-123603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-123603",
      "released": "2026-11-09T02:18:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T01:43:54Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}