Use-after-free in the JavaScript Engine component_CVE-2026-4723

9.8 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Thunderbird < 149.

Basic Information

ID CVE-2026-4723

Source mozilla

Published Mar 24, 2026 at 12:30

Modified Mar 25, 2026 at 19:50

Affected Product

Vendor Mozilla

Product Firefox

Version unspecified

Affected Versions Mozilla Firefox unspecified
Mozilla Thunderbird unspecified

CWE Classification

CWE-416

References

{
    "lastseen": "",
    "description": "Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Thunderbird < 149.",
    "published": "2026-03-24T12:30:31.266Z",
    "modified": "2026-03-25T19:50:09.415Z",
    "type": "cve",
    "title": "Use-after-free in the JavaScript Engine component",
    "source": "mozilla",
    "references": "https://bugzilla.mozilla.org/show_bug.cgi?id=2013573\nhttps://www.mozilla.org/security/advisories/mfsa2026-20/\nhttps://www.mozilla.org/security/advisories/mfsa2026-23/",
    "id": "CVE-2026-4723",
    "bulletinFamily": "",
    "cwe": [
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    ],
    "cvelist": null,
    "sourceData": "Mozilla Firefox unspecified\nMozilla Thunderbird unspecified",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Firefox",
    "version": "unspecified",
    "vendor": "Mozilla",
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    "ai_score": 0
}