CVE 9.8 CRITICAL

Use-after-free in the JavaScript Engine component_CVE-2026-0884

January 13, 2026 invoker category_cve

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 < 147 and Firefox ESR < 140.7.

AI Analysis

Use-after-free vulnerability in the JavaScript Engine component of Firefox, allowing for potential code execution and data compromise.

Basic Information

ID CVE-2026-0884

Source mozilla

Published Jan 13, 2026 at 13:30

Modified Jan 13, 2026 at 15:37

Affected Product

Vendor Mozilla

Product Firefox

Version unspecified

Affected Versions Mozilla Firefox unspecified
Mozilla Firefox ESR unspecified

CWE Classification

CWE-416

AI Assessment

AI Score 9.8 / 10

AI Severity Critical

Vendor Mozilla

Product Firefox

Version < 147, < 140.7

References

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    "lastseen": "",
    "description": "Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.",
    "published": "2026-01-13T13:30:56.543Z",
    "modified": "2026-01-13T15:37:27.838Z",
    "type": "cve",
    "title": "Use-after-free in the JavaScript Engine component",
    "source": "mozilla",
    "references": "https://bugzilla.mozilla.org/show_bug.cgi?id=2003588\nhttps://www.mozilla.org/security/advisories/mfsa2026-01/\nhttps://www.mozilla.org/security/advisories/mfsa2026-03/",
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    "cwe": [
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    "sourceData": "Mozilla Firefox unspecified\nMozilla Firefox ESR unspecified",
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    "cvss": {
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        "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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        "privilegesRequired": "",
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        "cvssV3": {
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    "href": "",
    "category_name": "CVE",
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    "product": "Firefox",
    "version": "unspecified",
    "vendor": "Mozilla",
    "ai_description": "Use-after-free vulnerability in the JavaScript Engine component of Firefox, allowing for potential code execution and data compromise.",
    "ai_severity": "Critical",
    "ai_vendor": "Mozilla",
    "ai_product": "Firefox",
    "ai_version": "< 147, < 140.7",
    "ai_score": 9.8
}

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