{
  "cveId": "CVE-2026-42955",
  "url": "https://patchblox.com/security/cve/CVE-2026-42955",
  "summary": "CVE-2026-42955 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-42955, released July 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time \u0027ghost domain\u0027 delegation renewal via glue records",
  "description": "In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the \u0027ghost domain names\u0027 family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other \u0027ghost domain names\u0027 attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value (\u0027cache-max-ttl\u0027). In configurations where \u0027harden-referral-path: yes\u0027 is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query.",
  "published": "2026-07-22T14:17:18Z",
  "severity": "Low",
  "cvss": 3.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "cwe": "Operation on a Resource after Expiration or Release",
  "epss": 0.00196,
  "epssPercentile": 0.09313,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42955",
  "fixes": [
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.26.1-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-42955",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42955",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.25.2-1",
      "fix": "DEBIAN-CVE-2026-42955",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42955",
      "released": "2026-07-28T14:13:38Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.25.2-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21550-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21550-1",
      "released": "2026-08-10T15:27:28Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 15.6",
      "fixedVersion": "1.25.2-150600.23.19.1",
      "fix": "SUSE-SU-2026:3885-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3885-1",
      "released": "2026-08-31T14:34:37Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 15.7",
      "fixedVersion": "1.25.2-150600.23.19.1",
      "fix": "SUSE-SU-2026:3885-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3885-1",
      "released": "2026-08-31T14:34:37Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "sles 16.0",
      "fixedVersion": "1.25.2-160000.1.1",
      "fix": "SUSE-SU-2026:23226-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23226-1",
      "released": "2026-08-10T15:26:22Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-devel",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-libs",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-utils",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.13",
      "fix": "ALAS2023-2026-2033",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2033",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}