{
  "cveId": "CVE-2026-44690",
  "url": "https://patchblox.com/security/cve/CVE-2026-44690",
  "summary": "CVE-2026-44690 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-44690, released July 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Cross-zone wildcard cache poisoning via RRSIG.labels manipulation",
  "description": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary sibling zones under NSEC-signed parent domains. A malicious actor with one registered domain under an NSEC-signed TLD can serve malicious insecure DNS responses for unrelated sibling domains (sharing the same parent zone). Arbitrary delegations that do not exist under the parent domain and are covered by the parent\u0027s NSEC chain can be brought into insecure existence by fraudulent wildcard DS records (less labels than expected, unknown algorithm) from the malicious sibling domain. This allows the malicious actor to inject insecure wildcard records for those delegations.",
  "published": "2026-07-22T00:00:00Z",
  "severity": "Moderate",
  "cvss": 8.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "cwe": "Insufficient Verification of Data Authenticity",
  "epss": 0.00153,
  "epssPercentile": 0.04461,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44690",
  "fixes": [
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm3",
      "fix": "libunbound8 1.9.4-2ubuntu1.11\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libunbound8-1.9.4-2ubuntu1.11-esm3",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.17",
      "fix": "libunbound8 1.13.1-1ubuntu5.17",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libunbound8-1.13.1-1ubuntu5.17",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.12",
      "fix": "libunbound8 1.19.2-1ubuntu3.12",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libunbound8-1.19.2-1ubuntu3.12",
      "released": "2026-09-16T02:17:00Z"
    },
    {
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      "product": "libunbound8",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.4",
      "fix": "libunbound8 1.24.2-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libunbound8-1.24.2-1ubuntu2.4",
      "released": "2026-09-16T02:17:00Z"
    },
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      "product": "python-unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm3",
      "fix": "python-unbound 1.9.4-2ubuntu1.11\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python-unbound-1.9.4-2ubuntu1.11-esm3",
      "released": "2026-09-16T02:17:00Z"
    },
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      "platform": "linux",
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      "fix": "RHSA-2026:55784",
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      "released": "2026-08-19T23:17:39Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-55841",
      "released": "2026-08-19T23:18:54Z"
    },
    {
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      "release": "Ubuntu 20.04 LTS (focal)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-unbound-1.9.4-2ubuntu1.11-esm3",
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      "platform": "linux",
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      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "fix": "python3-unbound 1.13.1-1ubuntu5.17",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-unbound-1.13.1-1ubuntu5.17",
      "released": "2026-09-16T02:17:00Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu3.12",
      "released": "2026-09-16T02:17:00Z"
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      "product": "python3-unbound",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-unbound-1.24.2-1ubuntu2.4",
      "released": "2026-09-16T02:17:00Z"
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      "fix": "ALAS2023-2026-2033",
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      "released": "2026-08-03T09:00:00Z"
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      "released": "2026-08-17T00:00:00Z"
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      "platform": "linux",
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      "platform": "linux",
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      "released": "2026-08-17T00:00:00Z"
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      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
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    {
      "platform": "linux",
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      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.1-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-44690",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44690",
      "released": "2026-07-28T14:13:38Z"
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    {
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      "fixedVersion": "1.25.2-1",
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      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44690",
      "released": "2026-07-28T14:13:38Z"
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    {
      "platform": "linux",
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      "fix": "RHSA-2026:55892",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-55892",
      "released": "2026-08-18T23:09:46Z"
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      "fix": "ELSA-2026-55784",
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      "fix": "ELSA-2026-55841",
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      "fix": "RLSA-2026:55841",
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