HarborGuard / CVE
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CRITICALCVE-2026-4701Published Modified CNA mozilla

CVE-2026-4701: Use-after-free in the JavaScript Engine component

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Metrics

CVSS v3.1
9.8
Severity
CRITICAL
Fixed in
140.9
Affected Products
2

Fix available

140.9149
Affected packages
  • Mozilla / Firefox
    Fixed in 140.9, 149
  • Mozilla / Thunderbird
    Fixed in 140.9, 149
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References