CVE-2026-6754

CVE-2026-6754: Use-after-free in the JavaScript Engine component

Published April 21, 2026
Last update June 30, 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 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Key dates

02Disclosure timeline

April 21, 2026 CVE published
June 30, 2026 Record updated