{
    "id": "CVE-2019-17026",
    "published": "2020-03-02 05:15:12",
    "last_modified": "2026-06-17 02:23:11",
    "cvss_score": "8.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "cwe": "CWE-843",
    "description": "Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.",
    "epss_score": "0.46311",
    "epss_percentile": "0.98778",
    "kev": 1,
    "kev_due": "2022-05-03",
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:25:29",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2022-05-03."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "mozilla",
            "product": "firefox"
        },
        {
            "vendor": "mozilla",
            "product": "thunderbird"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2019-17026",
        "date_added": "2021-11-03",
        "due_date": "2022-05-03",
        "vendor": "Mozilla",
        "product": "Firefox and Thunderbird",
        "name": "Mozilla Firefox And Thunderbird Type Confusion Vulnerability",
        "ransomware": 0
    },
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "49864",
            "title": "Firefox 72 IonMonkey - JIT Type Confusion",
            "date": "2021-05-13",
            "url": "https://www.exploit-db.com/exploits/49864"
        }
    ],
    "refs_list": [
        "http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1607443",
        "https://security.gentoo.org/glsa/202003-02",
        "https://usn.ubuntu.com/4335-1/",
        "https://www.mozilla.org/security/advisories/mfsa2020-03/",
        "https://www.mozilla.org/security/advisories/mfsa2020-04/",
        "http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1607443",
        "https://security.gentoo.org/glsa/202003-02",
        "https://usn.ubuntu.com/4335-1/",
        "https://www.mozilla.org/security/advisories/mfsa2020-03/",
        "https://www.mozilla.org/security/advisories/mfsa2020-04/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026"
    ]
}