{
  "cveId": "CVE-2026-5950",
  "url": "https://patchblox.com/security/cve/CVE-2026-5950",
  "summary": "CVE-2026-5950 is fixed in 20 products on 1 platform, first by bind9 1:9.20.18-1ubuntu2.1, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Unbounded resend loop in BIND 9 resolver",
  "description": "An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Moderate",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "cwe": "Unchecked Input for Loop Condition",
  "epss": 0.0066,
  "epssPercentile": 0.51806,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5950",
  "fixes": [
    {
      "platform": "linux",
      "product": "bind",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "9.20.23-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21123-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21123-1",
      "released": "2026-06-20T06:54:39Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 15.6",
      "fixedVersion": "9.18.49-150600.3.26.1",
      "fix": "SUSE-SU-2026:2676-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2676-1",
      "released": "2026-06-29T09:53:56Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 15.7",
      "fixedVersion": "9.20.23-150700.3.25.1",
      "fix": "SUSE-SU-2026:2673-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2673-1",
      "released": "2026-07-02T15:04:39Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 16.0",
      "fixedVersion": "9.20.23-160000.1.1",
      "fix": "SUSE-SU-2026:22198-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22198-1",
      "released": "2026-06-20T06:53:51Z"
    },
    {
      "platform": "linux",
      "product": "bind-chroot",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-devel",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-dnssec-utils",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-dnssec-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-doc",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-libs",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-license",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-utils",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.49-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-1755",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1755",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1:9.18.49-1~deb12u2",
      "fix": "DEBIAN-CVE-2026-5950",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-5950",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:9.20.23-1~deb13u1",
      "fix": "DEBIAN-CVE-2026-5950",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-5950",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 14",
      "fixedVersion": "1:9.20.23-1",
      "fix": "DEBIAN-CVE-2026-5950",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-5950",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.4",
      "fix": "bind9 1:9.20.11-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-1-9.20.11-1ubuntu2.4",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:9.20.18-1ubuntu2.1",
      "fix": "bind9 1:9.20.18-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bind9-1-9.20.18-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9-dnsutils 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9-dnsutils-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9-dnsutils 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9-dnsutils-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.4",
      "fix": "bind9-dnsutils 1:9.20.11-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-dnsutils-1-9.20.11-1ubuntu2.4",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:9.20.18-1ubuntu2.1",
      "fix": "bind9-dnsutils 1:9.20.18-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bind9-dnsutils-1-9.20.18-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9-host 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9-host-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9-host 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9-host-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.4",
      "fix": "bind9-host 1:9.20.11-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-host-1-9.20.11-1ubuntu2.4",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:9.20.18-1ubuntu2.1",
      "fix": "bind9-host 1:9.20.18-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bind9-host-1-9.20.18-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9-libs 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9-libs-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9-libs 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9-libs-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.4",
      "fix": "bind9-libs 1:9.20.11-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-libs-1-9.20.11-1ubuntu2.4",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:9.20.18-1ubuntu2.1",
      "fix": "bind9-libs 1:9.20.18-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bind9-libs-1-9.20.18-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9-utils 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9-utils-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9-utils 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9-utils-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.4",
      "fix": "bind9-utils 1:9.20.11-1ubuntu2.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-utils-1-9.20.11-1ubuntu2.4",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:9.20.18-1ubuntu2.1",
      "fix": "bind9-utils 1:9.20.18-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bind9-utils-1-9.20.18-1ubuntu2.1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9utils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "bind9utils 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bind9utils-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9utils",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "bind9utils 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bind9utils-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "dnsutils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:9.18.39-0ubuntu0.22.04.4",
      "fix": "dnsutils 1:9.18.39-0ubuntu0.22.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-dnsutils-1-9.18.39-0ubuntu0.22.04.4",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "dnsutils",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:9.18.39-0ubuntu0.24.04.5",
      "fix": "dnsutils 1:9.18.39-0ubuntu0.24.04.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-dnsutils-1-9.18.39-0ubuntu0.24.04.5",
      "released": "2026-05-27T17:38:28Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}