CVE-2026-8391

CVE-2026-8391: Other issue in the JavaScript Engine component

Published May 12, 2026
Last update July 15, 2026
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CVSS base score

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What the vulnerability does

01Description

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
July 15, 2026 Record updated