{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/centos8.4els/vex/2026/cve-2026-18477-els_os-centos8_4els.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-01T13:22:11Z",
      "generator": {
        "date": "2026-09-01T13:22:11Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-18477-ELS_OS-CENTOS8.4ELS",
      "initial_release_date": "2026-08-03T17:16:00Z",
      "revision_history": [
        {
          "date": "2026-08-03T17:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-08-14T14:42:52Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-09-01T13:22:11Z",
          "number": "3",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "3"
    },
    "title": "Security update on CVE-2026-18477"
  },
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        "category": "vendor",
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        "category": "vendor",
        "name": "CloudLinux"
      }
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        },
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        "relates_to_product_reference": "CentOS-8.4"
      },
      {
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        "full_product_name": {
          "name": "tar-2:1.30-5.el8.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 8.4",
          "product_id": "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els2.x86_64"
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        "relates_to_product_reference": "CentOS-8.4"
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-18477",
      "cwe": {
        "id": "CWE-367",
        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "notes": [
        {
          "category": "description",
          "text": "A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' 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—including extracting into a newly created directory without using the -P option do not mitigate the issue.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "known_affected": [
          "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els1.x86_64",
          "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els2.x86_64",
          "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els3.x86_64",
          "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els4.x86_64",
          "CentOS-8.4:tar-2:1.30-5.el8.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-18477"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:49361",
          "url": "https://access.redhat.com/errata/RHSA-2026:49361"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-18477",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18477"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2509735",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509735"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:61581",
          "url": "https://access.redhat.com/errata/RHSA-2026:61581"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:61783",
          "url": "https://access.redhat.com/errata/RHSA-2026:61783"
        }
      ],
      "release_date": "2026-08-03T17:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-14T14:16:04.902541Z",
          "details": "This issue is reachable only during GNU tar’s non-default incremental-archive restore flow (dumpdir R/T/X renames), and it requires a local attacker who can write into the directory being backed up and who also has access to the system where an administrator later performs the restore. Given the high attack complexity, required user interaction (a restore operation), and integrity-only impact confined to the brief restore window, real-world risk to centrally managed server/VM environments is low. Accordingly, it can be safely deprioritized relative to remotely exploitable or persistent privilege‑escalation flaws.",
          "product_ids": [
            "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els1.x86_64",
            "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els2.x86_64",
            "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els3.x86_64",
            "CentOS-8.4:tar-2:1.30-5.el8.tuxcare.els4.x86_64",
            "CentOS-8.4:tar-2:1.30-5.el8.x86_64"
          ]
        }
      ]
    }
  ]
}