{
  "cveId": "CVE-2026-44608",
  "url": "https://patchblox.com/security/cve/CVE-2026-44608",
  "summary": "CVE-2026-44608 is fixed in 14 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: Routine.",
  "title": "Use after free and crash under special conditions in RPZ code",
  "description": "NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with \u0027rpz-nsip\u0027/\u0027rpz-nsdname\u0027 triggers) it could result in heap use-after-free and eventual crash. An adversary can exploit the vulnerability if conditions are first met on a vulnerable Unbound, i.e., multi-threaded, an RPZ zone with \u0027rpz-nsip\u0027/\u0027rpz-nsdname\u0027 triggers and an ongoing XFR for that RPZ zone. Local RPZ files do not trigger the vulnerability. If the timing is right and an XFR happens at the same time another thread needs to read that RPZ zone, the reader may not hold the lock long enough and the thread applying the XFR may free objects that the reader is about to walk causing the use-after-free. Unbound 1.25.1 contains a patch with a fix to the locking code.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Moderate",
  "cvss": 5.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Improper Resource Locking",
  "epss": 0.00255,
  "epssPercentile": 0.17238,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44608",
  "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": "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-2026-44608",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44608",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.1-1",
      "fix": "DEBIAN-CVE-2026-44608",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-44608",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "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"
    },
    {
      "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": "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"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 16.0",
      "fixedVersion": "1.24.1-160000.2.1",
      "fix": "SUSE-SU-2026:22160-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22160-1",
      "released": "2026-06-18T14:32:33Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.8",
      "fix": "unbound-anchor 1.19.2-1ubuntu3.8",
      "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",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu2.3",
      "fix": "unbound-anchor 1.22.0-2ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-anchor-1.22.0-2ubuntu2.3",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.24.2-1ubuntu2.1",
      "fix": "unbound-anchor 1.24.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-unbound-anchor-1.24.2-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "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-anchor-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-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-debugsource",
      "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-devel",
      "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-host",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.8",
      "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"
    },
    {
      "platform": "linux",
      "product": "unbound-host",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu2.3",
      "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",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "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",
      "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-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"
    },
    {
      "platform": "linux",
      "product": "unbound-utils",
      "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-utils-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"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}