{
    "id": "CVE-2018-8780",
    "published": "2018-04-03 22:29:00",
    "last_modified": "2026-06-17 02:05:22",
    "cvss_score": "9.1",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
    "cwe": "CWE-22",
    "description": "In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, the Dir.open, Dir.new, Dir.entries and Dir.empty? methods do not check NULL characters. When using the corresponding method, unintentional directory traversal may be performed.",
    "epss_score": "0.09718",
    "epss_percentile": "0.95385",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:19",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.1), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "ruby-lang",
            "product": "ruby"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html",
        "http://www.securityfocus.com/bid/103739",
        "http://www.securitytracker.com/id/1042004",
        "https://access.redhat.com/errata/RHSA-2018:3729",
        "https://access.redhat.com/errata/RHSA-2018:3730",
        "https://access.redhat.com/errata/RHSA-2018:3731",
        "https://access.redhat.com/errata/RHSA-2019:2028",
        "https://access.redhat.com/errata/RHSA-2020:0542",
        "https://access.redhat.com/errata/RHSA-2020:0591",
        "https://access.redhat.com/errata/RHSA-2020:0663",
        "https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html",
        "https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html",
        "https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html",
        "https://usn.ubuntu.com/3626-1/",
        "https://www.debian.org/security/2018/dsa-4259",
        "https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/",
        "https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/",
        "https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/",
        "https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/",
        "https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/",
        "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html",
        "http://www.securityfocus.com/bid/103739",
        "http://www.securitytracker.com/id/1042004",
        "https://access.redhat.com/errata/RHSA-2018:3729",
        "https://access.redhat.com/errata/RHSA-2018:3730"
    ]
}