{
  "cveId": "CVE-2026-42959",
  "url": "https://patchblox.com/security/cve/CVE-2026-42959",
  "summary": "CVE-2026-42959 is fixed in 17 products on 1 platform, first by libunbound2 1.6.7-1ubuntu2.6\u002Besm4, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Crash during DNSSEC validation of malicious content",
  "description": "NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Moderate",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Access of Uninitialized Pointer",
  "epss": 0.00807,
  "epssPercentile": 0.57064,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42959",
  "fixes": [
    {
      "platform": "linux",
      "product": "libunbound2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm4",
      "fix": "libunbound2 1.6.7-1ubuntu2.6\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libunbound2-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "fix": "libunbound8 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libunbound8-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.15",
      "fix": "libunbound8 1.13.1-1ubuntu5.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libunbound8-1.13.1-1ubuntu5.15",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "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": "python-unbound",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm4",
      "fix": "python-unbound 1.6.7-1ubuntu2.6\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-unbound-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "fix": "python-unbound 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python-unbound-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 8",
      "fixedVersion": "0:1.16.2-5.11.el8_10",
      "fix": "RHSA-2026:24365",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-24365",
      "released": "2026-06-24T14:07:58Z"
    },
    {
      "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 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm4",
      "fix": "python3-unbound 1.6.7-1ubuntu2.6\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-unbound-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "fix": "python3-unbound 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-unbound-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.15",
      "fix": "python3-unbound 1.13.1-1ubuntu5.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-unbound-1.13.1-1ubuntu5.15",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "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"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 8",
      "fixedVersion": "1.16.2-5.11.el8_10",
      "fix": "ALSA-2026:24365",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-24365",
      "released": "2026-06-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "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"
    },
    {
      "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"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 8",
      "fixedVersion": "0:1.16.2-5.11.el8_10",
      "fix": "ELSA-2026-24365",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-24365",
      "released": "2026-06-08T00:00:00Z"
    },
    {
      "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",
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      "fix": "ALAS2023-2026-1756",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "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-2026-42959",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42959",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.1-1",
      "fix": "DEBIAN-CVE-2026-42959",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42959",
      "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",
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      "fixedVersion": "0:1.16.2-5.11.el8_10",
      "fix": "RHSA-2026:24365",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-24365",
      "released": "2026-06-24T14:07:58Z"
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    {
      "platform": "linux",
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      "fix": "RHSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-24369",
      "released": "2026-06-24T14:09:17Z"
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    {
      "platform": "linux",
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      "fix": "unbound 1.6.7-1ubuntu2.6\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
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      "release": "Ubuntu 20.04 LTS (focal)",
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      "fix": "unbound 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.15",
      "fix": "unbound 1.13.1-1ubuntu5.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-1.13.1-1ubuntu5.15",
      "released": "2026-05-27T17:38:24Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "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"
    },
    {
      "platform": "linux",
      "product": "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",
      "product": "unbound",
      "release": "almalinux 8",
      "fixedVersion": "1.16.2-5.11.el8_10",
      "fix": "ALSA-2026:24365",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-24365",
      "released": "2026-06-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "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",
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      "release": "amzn 2023",
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "released": "2026-05-25T09:00:00Z"
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      "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",
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      "release": "ol 8",
      "fixedVersion": "0:1.16.2-5.11.el8_10",
      "fix": "ELSA-2026-24365",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-24365",
      "released": "2026-06-08T00:00:00Z"
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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",
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      "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",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-23231",
      "released": "2026-06-06T12:04:50Z"
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    {
      "platform": "linux",
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      "release": "rocky 8",
      "fixedVersion": "0:1.16.2-5.11.el8_10",
      "fix": "RLSA-2026:24365",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-24365",
      "released": "2026-06-11T06:00:31Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 9",
      "fixedVersion": "0:1.24.2-3.el9_8.1",
      "fix": "RLSA-2026:24369",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-24369",
      "released": "2026-06-11T12:03:24Z"
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    {
      "platform": "linux",
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      "release": "sles 16.0",
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      "fix": "SUSE-SU-2026:22160-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22160-1",
      "released": "2026-06-18T14:32:33Z"
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    {
      "platform": "linux",
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      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "fix": "unbound-anchor 1.6.7-1ubuntu2.6\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-anchor-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "fix": "unbound-anchor 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-anchor-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.15",
      "fix": "unbound-anchor 1.13.1-1ubuntu5.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-anchor-1.13.1-1ubuntu5.15",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "fix": "unbound-anchor 1.19.2-1ubuntu3.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu3.8",
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    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 25.10 (questing)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-anchor-1.22.0-2ubuntu2.3",
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    {
      "platform": "linux",
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