CVE-2026-4698

CVE-2026-4698: JIT miscompilation in the JavaScript Engine: JIT component

Published March 24, 2026
Last update May 22, 2026
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CVSS base score

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What the vulnerability does

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Key dates

Disclosure timeline

March 24, 2026 CVE published
May 22, 2026 Record updated