{
  "cveId": "CVE-2026-33278",
  "url": "https://patchblox.com/security/cve/CVE-2026-33278",
  "summary": "CVE-2026-33278 is fixed in 15 products on 1 platform, first by libunbound8 1.24.2-1ubuntu2.1, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Possible arbitrary code execution during DNSSEC validation",
  "description": "NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination pointer. An adversary can exploit the vulnerability by controlling a malicious signed zone and querying a vulnerable Unbound. When DS sub-queries need to suspend validation due to NSEC3 computational budget exhaustion (introduced in Unbound 1.19.1), Unbound deep-copies response messages to preserve them across memory region teardown. A struct-assignment bug overwrites the destination\u0027s pointer with the source\u0027s pointer. After the sub-query region is freed, the resumed validator dereferences this dangling pointer, triggering a crash or potentially enabling arbitrary code execution. Unbound 1.25.1 contains a patch with a fix to preserve the correct pointer when deep copying the data structure.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Use After Free",
  "epss": 0.0142,
  "epssPercentile": 0.73013,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33278",
  "fixes": [
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.8",
      "fix": "libunbound8 1.19.2-1ubuntu3.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libunbound8-1.19.2-1ubuntu3.8",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu2.3",
      "fix": "libunbound8 1.22.0-2ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libunbound8-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.1",
      "fix": "libunbound8 1.24.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libunbound8-1.24.2-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 9",
      "fixedVersion": "0:1.24.2-3.el9_8.1",
      "fix": "RHSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-24369",
      "released": "2026-06-24T14:09:17Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.8",
      "fix": "python3-unbound 1.19.2-1ubuntu3.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu3.8",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu2.3",
      "fix": "python3-unbound 1.22.0-2ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-python3-unbound-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.1",
      "fix": "python3-unbound 1.24.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-unbound-1.24.2-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 10",
      "fixedVersion": "1.24.2-7.el10_2.1",
      "fix": "ALSA-2026:23231",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-23231",
      "released": "2026-06-04T00:00:00Z"
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      "platform": "linux",
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      "release": "almalinux 9",
      "fixedVersion": "1.24.2-3.el9_8.1",
      "fix": "ALSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-24369",
      "released": "2026-06-08T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.12",
      "fix": "ALAS2023-2026-1756",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 10",
      "fixedVersion": "0:1.24.2-7.el10_2.2",
      "fix": "ELSA-2026-23231",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-23231",
      "released": "2026-07-21T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 9",
      "fixedVersion": "0:1.24.2-3.el9_8.1",
      "fix": "ELSA-2026-24369",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-24369",
      "released": "2026-06-23T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.12",
      "fix": "ALAS2023-2026-1756",
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      "released": "2026-05-25T09:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.22.0-2\u002Bdeb13u3",
      "fix": "DEBIAN-CVE-2026-33278",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-33278",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.1-1",
      "fix": "DEBIAN-CVE-2026-33278",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-33278",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 10",
      "fixedVersion": "1.24.2-7.el10_2.1",
      "fix": "RHSA-2026:23231",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-23231",
      "released": "2026-05-20T11:33:59Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 9",
      "fixedVersion": "0:1.24.2-3.el9_8.1",
      "fix": "RHSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-24369",
      "released": "2026-06-24T14:09:17Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.8",
      "fix": "unbound 1.19.2-1ubuntu3.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-1.19.2-1ubuntu3.8",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu2.3",
      "fix": "unbound 1.22.0-2ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.1",
      "fix": "unbound 1.24.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-1.24.2-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "almalinux 10",
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      "fix": "ALSA-2026:23231",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-23231",
      "released": "2026-06-04T00:00:00Z"
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    {
      "platform": "linux",
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      "release": "almalinux 9",
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      "fix": "ALSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-24369",
      "released": "2026-06-08T00:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.12",
      "fix": "ALAS2023-2026-1756",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "ol 10",
      "fixedVersion": "0:1.24.2-7.el10_2.2",
      "fix": "ELSA-2026-23231",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-23231",
      "released": "2026-07-21T00:00:00Z"
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      "platform": "linux",
      "product": "unbound",
      "release": "ol 9",
      "fixedVersion": "0:1.24.2-3.el9_8.1",
      "fix": "ELSA-2026-24369",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-24369",
      "released": "2026-06-23T00:00:00Z"
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      "platform": "linux",
      "product": "unbound",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.24.1-160000.2.1",
      "fix": "OPENSUSE-SU-2026:21083-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21083-1",
      "released": "2026-06-18T14:31:02Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 10",
      "fixedVersion": "0:1.24.2-7.el10_2.1",
      "fix": "RLSA-2026:23231",
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      "released": "2026-06-06T12:04:50Z"
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      "platform": "linux",
      "product": "unbound",
      "release": "rocky 9",
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      "fix": "RLSA-2026:24369",
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      "released": "2026-06-11T12:03:24Z"
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      "platform": "linux",
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      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-anchor-1.24.2-1ubuntu2.1",
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      "fix": "ELSA-2026-23231",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-23231",
      "released": "2026-07-21T00:00:00Z"
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      "fix": "ALSA-2026:24369",
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      "fix": "ELSA-2026-24369",
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      "released": "2026-06-04T00:00:00Z"
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      "url": "https://patchblox.com/security/fix/linux/alsa-2026-24369",
      "released": "2026-06-08T00:00:00Z"
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      "platform": "linux",
      "product": "unbound-dracut",
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      "fix": "ELSA-2026-23231",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-23231",
      "released": "2026-07-21T00:00:00Z"
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      "fix": "ELSA-2026-24369",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-24369",
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      "product": "unbound-host",
      "release": "Ubuntu 25.10 (questing)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-host-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
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      "product": "unbound-host",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
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  "attribution": {
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}