{
  "cveId": "CVE-2026-18477",
  "url": "https://patchblox.com/security/cve/CVE-2026-18477",
  "summary": "CVE-2026-18477 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: toctou in incremental dumpdir \u0027x\u0027 rename handling allows restore path escape",
  "description": "A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar\u0027s incremental dumpdir \u0027X\u0027 rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows\u2014including extracting into a newly created directory without using the -P option do not mitigate the issue.",
  "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": "Time-of-check Time-of-use (TOCTOU) Race Condition",
  "epss": 0.00104,
  "epssPercentile": 0.01011,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18477",
  "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"
  }
}