{
  "cveId": "CVE-2026-50243",
  "url": "https://patchblox.com/security/cve/CVE-2026-50243",
  "summary": "CVE-2026-50243 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-50243, released July 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "\u0027response-ip\u0027/\u0027rpz\u0027 can rewrite BOGUS answers instead of returning SERVFAIL",
  "description": "In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the \u0027respip\u0027 module in front of the validator together with a \u0027response-ip\u0027 redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator\u0027s configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a \u0027response-ip\u0027/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator\u0027s configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator\u0027s configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator\u0027s configured target.",
  "published": "2026-07-22T14:17:20Z",
  "severity": "Moderate",
  "cvss": 3.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "cwe": "Use of Less Trusted Source",
  "epss": 0.00109,
  "epssPercentile": 0.0122,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50243",
  "fixes": [
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.1-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-50243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-50243",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.2-1",
      "fix": "DEBIAN-CVE-2026-50243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-50243",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "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"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-devel",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-libs",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-utils",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "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"
  }
}