{
  "cveId": "CVE-2026-42960",
  "url": "https://patchblox.com/security/cve/CVE-2026-42960",
  "summary": "CVE-2026-42960 is fixed in 16 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": "Possible cache poisoning via promiscuous records for the authority section",
  "description": "NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick Unbound to cache such records. If an adversary is able to attach such records in a reply (i.e., spoofed packet, fragmentation attack) he would be able to poison Unbound\u0027s cache. A malicious actor can exploit the possible poisonous effect by injecting RRSets other than NS that are also accompanied by address records in a reply, for example MX. This could be achieved by trying to spoof a reply packet or fragmentation attacks. Unbound would then accept the relative address records in the additional section and cache them if the authority RRSet has enough trust at this point, i.e., in-zone data for the delegation point. Unbound 1.25.1 contains a patch with a fix that disregards address records from the additional section if they are not explicitly relevant only to authority NS records, mitigating the possible poison effect. This is a complement fix to CVE-2025-11411.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Moderate",
  "cvss": 10,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H",
  "cwe": "Acceptance of Extraneous Untrusted Data With Trusted Data",
  "epss": 0.00262,
  "epssPercentile": 0.18092,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42960",
  "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": "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": "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-debuginfo",
      "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": "Debian 13.5 (trixie)",
      "fixedVersion": "1.22.0-2\u002Bdeb13u3",
      "fix": "DEBIAN-CVE-2026-42960",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42960",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.1-1",
      "fix": "DEBIAN-CVE-2026-42960",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42960",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.6.7-1ubuntu2.6\u002Besm4",
      "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",
      "product": "unbound",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "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"
    },
    {
      "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"
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    {
      "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": "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"
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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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      "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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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-anchor-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-anchor-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
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      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-anchor-1.13.1-1ubuntu5.15",
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    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu3.8",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-anchor-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
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      "platform": "linux",
      "product": "unbound-anchor",
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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": "ALAS2023-2026-1756",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
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      "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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    {
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    },
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      "platform": "linux",
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      "released": "2026-05-25T09:00:00Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-unbound-host-1.6.7-1ubuntu2.6-esm4",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-host",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.4-2ubuntu1.11\u002Besm1",
      "fix": "unbound-host 1.9.4-2ubuntu1.11\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-unbound-host-1.9.4-2ubuntu1.11-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-host",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.15",
      "fix": "unbound-host 1.13.1-1ubuntu5.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-host-1.13.1-1ubuntu5.15",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "unbound-host",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "fix": "unbound-host 1.19.2-1ubuntu3.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-host-1.19.2-1ubuntu3.8",
      "released": "2026-05-27T17:38:28Z"
    },
    {
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      "release": "Ubuntu 25.10 (questing)",
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      "fix": "unbound-host 1.22.0-2ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-host-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "unbound-host",
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      "fixedVersion": "1.24.2-1ubuntu2.1",
      "fix": "unbound-host 1.24.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-host-1.24.2-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-libs",
      "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"
    },
    {
      "platform": "linux",
      "product": "unbound-libs-debuginfo",
      "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"
    },
    {
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      "product": "unbound-utils",
      "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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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1756",
      "released": "2026-05-25T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}