CVE-2026-4723

CVE-2026-4723: Use-after-free in the JavaScript Engine component

Published March 24, 2026
Last update April 13, 2026
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CVSS base score

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What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

March 24, 2026 CVE published
April 13, 2026 Record updated