{
    "id": "CVE-2018-18500",
    "published": "2019-02-05 21:29:00",
    "last_modified": "2026-06-17 01:47:24",
    "cvss_score": "9.8",
    "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:H",
    "cwe": "CWE-416",
    "description": "A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.",
    "epss_score": "0.12658",
    "epss_percentile": "0.96145",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-03 18:17:20",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 12.7% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "mozilla",
            "product": "firefox"
        },
        {
            "vendor": "mozilla",
            "product": "firefox_esr"
        },
        {
            "vendor": "mozilla",
            "product": "thunderbird"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_desktop"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_aus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_tus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_workstation"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html",
        "http://www.securityfocus.com/bid/106781",
        "https://access.redhat.com/errata/RHSA-2019:0218",
        "https://access.redhat.com/errata/RHSA-2019:0219",
        "https://access.redhat.com/errata/RHSA-2019:0269",
        "https://access.redhat.com/errata/RHSA-2019:0270",
        "https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html",
        "https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html",
        "https://security.gentoo.org/glsa/201903-04",
        "https://security.gentoo.org/glsa/201904-07",
        "https://usn.ubuntu.com/3874-1/",
        "https://usn.ubuntu.com/3897-1/",
        "https://www.debian.org/security/2019/dsa-4376",
        "https://www.debian.org/security/2019/dsa-4392",
        "https://www.mozilla.org/security/advisories/mfsa2019-01/",
        "https://www.mozilla.org/security/advisories/mfsa2019-02/",
        "https://www.mozilla.org/security/advisories/mfsa2019-03/",
        "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html",
        "http://www.securityfocus.com/bid/106781",
        "https://access.redhat.com/errata/RHSA-2019:0218",
        "https://access.redhat.com/errata/RHSA-2019:0219",
        "https://access.redhat.com/errata/RHSA-2019:0269",
        "https://access.redhat.com/errata/RHSA-2019:0270",
        "https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html",
        "https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html"
    ]
}