{
    "id": "CVE-2025-4918",
    "published": "2025-05-17 22:15:19",
    "last_modified": "2026-09-30 18:10:00",
    "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-125",
    "description": "An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.",
    "epss_score": "0.09384",
    "epss_percentile": "0.95266",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:45",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "mozilla",
            "product": "firefox"
        },
        {
            "vendor": "mozilla",
            "product": "thunderbird"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1966612",
        "https://www.mozilla.org/security/advisories/mfsa2025-36/",
        "https://www.mozilla.org/security/advisories/mfsa2025-37/",
        "https://www.mozilla.org/security/advisories/mfsa2025-38/",
        "https://www.mozilla.org/security/advisories/mfsa2025-40/",
        "https://www.mozilla.org/security/advisories/mfsa2025-41/",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html",
        "https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write",
        "https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write"
    ]
}