{
  "cveId": "CVE-2026-54478",
  "url": "https://patchblox.com/security/cve/CVE-2026-54478",
  "summary": "CVE-2026-54478 is fixed in unbound on 1 platform, first by DEBIAN-CVE-2026-54478, released July 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "DNS Cookie bypass when combined with proxy-protocol use",
  "description": "In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a \u0027proxy-protocol-port\u0027 interface with \u0027answer-cookie: yes\u0027, the RFC 9018 server-cookie SipHash is computed over the proxy\u0027s wire address instead of the PROXYv2-declared client. One server cookie obtained through a given proxy node therefore validates for every PROXYv2-declared source behind that node. On a UDP\u002Bproxy-protocol front, an off-path attacker can harvest one cookie with a single legitimate query, then replay it under any spoofed source and pass DNS Cookie checks that were deployed to defeat this in the first place.",
  "published": "2026-07-22T14:17:21Z",
  "severity": "Low",
  "cvss": 3.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "cwe": "Authentication Bypass by Spoofing",
  "epss": 0.00241,
  "epssPercentile": 0.15322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54478",
  "fixes": [
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.1-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-54478",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-54478",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.2-1",
      "fix": "DEBIAN-CVE-2026-54478",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-54478",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.25.2-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21550-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21550-1",
      "released": "2026-08-10T15:27:28Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 15.6",
      "fixedVersion": "1.25.2-150600.23.19.1",
      "fix": "SUSE-SU-2026:3885-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3885-1",
      "released": "2026-08-31T14:34:37Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 15.7",
      "fixedVersion": "1.25.2-150600.23.19.1",
      "fix": "SUSE-SU-2026:3885-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3885-1",
      "released": "2026-08-31T14:34:37Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 16.0",
      "fixedVersion": "1.25.2-160000.1.1",
      "fix": "SUSE-SU-2026:23226-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23226-1",
      "released": "2026-08-10T15:26:22Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}