CVE-2026-4702

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-843

Affected software

No affected versions have been published.

Timeline

Published: Mar 24, 2026
Last modified: Jun 17, 2026
NVD status: Modified

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