{
  "cveId": "CVE-2026-81634",
  "url": "https://patchblox.com/security/cve/CVE-2026-81634",
  "summary": "CVE-2026-81634 is fixed in 17 products on 1 platform, first by libunbound2 1.6.7-1ubuntu2.6\u002Besm6, released September 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Possible heap buffer overflow during DNSSEC canonicalization",
  "description": "In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead to a heap buffer overflow during the RRSet canonicalisation routine. This is caused by missing to add the first owner name into the buffer length check. A malicious actor operating a malicious name server or tampering with an incoming response to Unbound (canonicalisation happens before DNSSEC validation), can trigger the vulnerability.",
  "published": "2026-09-16T02:17:00Z",
  "severity": "Important",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Heap-based Buffer Overflow",
  "epss": 0.0048,
  "epssPercentile": 0.41652,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81634",
  "fixes": [
    {
      "platform": "linux",
      "product": "libunbound2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm6",
      "fix": "libunbound2 1.6.7-1ubuntu2.6\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libunbound2-1.6.7-1ubuntu2.6-esm6",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "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"
    },
    {
      "platform": "linux",
      "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"
    },
    {
      "platform": "linux",
      "product": "python-unbound",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm6",
      "fix": "python-unbound 1.6.7-1ubuntu2.6\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-unbound-1.6.7-1ubuntu2.6-esm6",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "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"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 8",
      "fixedVersion": "0:1.16.2-5.14.el8_10.4",
      "fix": "RHSA-2026:70754",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-70754",
      "released": "2026-09-23T19:19:34Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 9",
      "fixedVersion": "0:1.24.2-3.el9_8.8",
      "fix": "RHSA-2026:71487",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-71487",
      "released": "2026-09-24T19:32:44Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm6",
      "fix": "python3-unbound 1.6.7-1ubuntu2.6\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-unbound-1.6.7-1ubuntu2.6-esm6",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm3",
      "fix": "python3-unbound 1.9.4-2ubuntu1.11\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-unbound-1.9.4-2ubuntu1.11-esm3",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.17",
      "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"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.12",
      "fix": "python3-unbound 1.19.2-1ubuntu3.12",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu3.12",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.4",
      "fix": "python3-unbound 1.24.2-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-unbound-1.24.2-1ubuntu2.4",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 10",
      "fixedVersion": "1.24.2-7.el10_2.6",
      "fix": "ALSA-2026:71419",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-71419",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 8",
      "fixedVersion": "1.16.2-5.14.el8_10.4",
      "fix": "ALSA-2026:70754",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-70754",
      "released": "2026-09-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 9",
      "fixedVersion": "1.24.2-3.el9_8.8",
      "fix": "ALSA-2026:71487",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-71487",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.15",
      "fix": "ALAS2023-2026-3127",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3127",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 10",
      "fixedVersion": "0:1.24.2-7.el10_2.6",
      "fix": "ELSA-2026-71419",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71419",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 8",
      "fixedVersion": "0:1.16.2-5.14.el8_10.4",
      "fix": "ELSA-2026-70754",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-70754",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 9",
      "fixedVersion": "0:1.24.2-3.el9_8.8",
      "fix": "ELSA-2026-71487",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71487",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.15",
      "fix": "ALAS2023-2026-3127",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3127",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.1-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-81634",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-81634",
      "released": "2026-09-19T18:30:58Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.26.1-1",
      "fix": "DEBIAN-CVE-2026-81634",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-81634",
      "released": "2026-09-19T18:30:58Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 10",
      "fixedVersion": "1.24.2-7.el10_2.6",
      "fix": "RHSA-2026:71419",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-71419",
      "released": "2026-09-24T19:32:44Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 8",
      "fixedVersion": "0:1.16.2-5.14.el8_10.4",
      "fix": "RHSA-2026:70754",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-70754",
      "released": "2026-09-23T19:19:34Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 9",
      "fixedVersion": "0:1.24.2-3.el9_8.8",
      "fix": "RHSA-2026:71487",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-71487",
      "released": "2026-09-24T19:32:44Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm6",
      "fix": "unbound 1.6.7-1ubuntu2.6\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-1.6.7-1ubuntu2.6-esm6",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "fix": "unbound 1.9.4-2ubuntu1.11\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-1.9.4-2ubuntu1.11-esm3",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-1.13.1-1ubuntu5.17",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-1.19.2-1ubuntu3.12",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-1.24.2-1ubuntu2.4",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "almalinux 10",
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      "fix": "ALSA-2026:71419",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-71419",
      "released": "2026-09-24T00:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "almalinux 8",
      "fixedVersion": "1.16.2-5.14.el8_10.4",
      "fix": "ALSA-2026:70754",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-70754",
      "released": "2026-09-23T00:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "almalinux 9",
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      "fix": "ALSA-2026:71487",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-71487",
      "released": "2026-09-24T00:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.15",
      "fix": "ALAS2023-2026-3127",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3127",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "ol 10",
      "fixedVersion": "0:1.24.2-7.el10_2.6",
      "fix": "ELSA-2026-71419",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71419",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "ol 8",
      "fixedVersion": "0:1.16.2-5.14.el8_10.4",
      "fix": "ELSA-2026-70754",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-70754",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "ol 9",
      "fixedVersion": "0:1.24.2-3.el9_8.8",
      "fix": "ELSA-2026-71487",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71487",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.26.1-160000.1.1",
      "fix": "OPENSUSE-SU-2026:22082-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22082-1",
      "released": "2026-11-07T00:48:28Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 10",
      "fixedVersion": "0:1.24.2-7.el10_2.6",
      "fix": "RLSA-2026:71419",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-71419",
      "released": "2026-09-25T12:09:37Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 8",
      "fixedVersion": "0:1.16.2-5.14.el8_10.4",
      "fix": "RLSA-2026:70754",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-70754",
      "released": "2026-09-24T06:01:33Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 9",
      "fixedVersion": "0:1.24.2-3.el9_8.8",
      "fix": "RLSA-2026:71487",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-71487",
      "released": "2026-09-25T18:04:58Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 15.6",
      "fixedVersion": "1.26.1-150600.23.24.1",
      "fix": "SUSE-SU-2026:4620-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4620-1",
      "released": "2026-11-07T00:43:02Z"
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    {
      "platform": "linux",
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      "release": "sles 15.7",
      "fixedVersion": "1.26.1-150600.23.24.1",
      "fix": "SUSE-SU-2026:4620-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4620-1",
      "released": "2026-11-07T00:43:02Z"
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      "platform": "linux",
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      "release": "sles 16.0",
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      "fix": "SUSE-SU-2026:24226-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24226-1",
      "released": "2026-11-07T00:45:20Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-anchor-1.6.7-1ubuntu2.6-esm6",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm3",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-anchor-1.9.4-2ubuntu1.11-esm3",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.17",
      "fix": "unbound-anchor 1.13.1-1ubuntu5.17",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-anchor-1.13.1-1ubuntu5.17",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.12",
      "fix": "unbound-anchor 1.19.2-1ubuntu3.12",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu3.12",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.4",
      "fix": "unbound-anchor 1.24.2-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-anchor-1.24.2-1ubuntu2.4",
      "released": "2026-09-16T02:17:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "almalinux 10",
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      "fix": "ALSA-2026:71419",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-71419",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.15",
      "fix": "ALAS2023-2026-3127",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3127",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
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