{
    "id": "CVE-2018-10191",
    "published": "2018-04-17 21:29:00",
    "last_modified": "2026-06-17 01:33:38",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-190",
    "description": "In versions of mruby up to and including 1.4.0, an integer overflow exists in src/vm.c::mrb_vm_exec() when handling OP_GETUPVAR in the presence of deep scope nesting, resulting in a use-after-free. An attacker that can cause Ruby code to be run can use this to possibly execute arbitrary code.",
    "epss_score": "0.02588",
    "epss_percentile": "0.84967",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-14 18:17:17",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "mruby",
            "product": "mruby"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626",
        "https://github.com/mruby/mruby/issues/3995",
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html",
        "https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626",
        "https://github.com/mruby/mruby/issues/3995",
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html"
    ]
}