{
  "cveId": "CVE-2026-18508",
  "url": "https://patchblox.com/security/cve/CVE-2026-18508",
  "summary": "CVE-2026-18508 is fixed in tar on 1 platform, first by RHSA-2026:61586, released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite",
  "description": "A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.",
  "published": "2026-07-31T00:00:00Z",
  "severity": "Moderate",
  "cvss": 5.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
  "cwe": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
  "epss": 0.00141,
  "epssPercentile": 0.03451,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18508",
  "fixes": [
    {
      "platform": "linux",
      "product": "tar",
      "release": "RHEL 10",
      "fixedVersion": "1.35-13.el10_2",
      "fix": "RHSA-2026:61586",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-61586",
      "released": "2026-07-31T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "RHEL 8",
      "fixedVersion": "2:1.30-13.el8_10",
      "fix": "RHSA-2026:70390",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-70390",
      "released": "2026-09-23T19:19:34Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "RHEL 9",
      "fixedVersion": "2:1.34-13.el9_8",
      "fix": "RHSA-2026:61581",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-61581",
      "released": "2026-09-13T12:47:53Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "almalinux 10",
      "fixedVersion": "2:1.35-13.el10_2",
      "fix": "ALSA-2026:61586",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-61586",
      "released": "2026-08-31T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "almalinux 8",
      "fixedVersion": "2:1.30-13.el8_10",
      "fix": "ALSA-2026:70390",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-70390",
      "released": "2026-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "almalinux 9",
      "fixedVersion": "2:1.34-13.el9_8",
      "fix": "ALSA-2026:61581",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-61581",
      "released": "2026-08-31T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "ol 10",
      "fixedVersion": "2:1.35-13.el10_2",
      "fix": "ELSA-2026-61586-0",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-61586-0",
      "released": "2026-09-01T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "ol 8",
      "fixedVersion": "2:1.30-13.el8_10",
      "fix": "ELSA-2026-70390",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-70390",
      "released": "2026-09-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "ol 9",
      "fixedVersion": "2:1.34-13.el9_8",
      "fix": "ELSA-2026-61581-0",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-61581-0",
      "released": "2026-09-01T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "rocky 10",
      "fixedVersion": "2:1.35-13.el10_2",
      "fix": "RLSA-2026:61586",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-61586",
      "released": "2026-09-11T00:11:04Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "rocky 8",
      "fixedVersion": "2:1.30-13.el8_10",
      "fix": "RLSA-2026:70390",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-70390",
      "released": "2026-09-24T06:01:09Z"
    },
    {
      "platform": "linux",
      "product": "tar",
      "release": "rocky 9",
      "fixedVersion": "2:1.34-13.el9_8",
      "fix": "RLSA-2026:61581",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-61581",
      "released": "2026-09-01T06:05:33Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}