CVE-2026-84121: Sandbox escape due to use-after-free in the DOM: Security component. T ...

Severity: Critical

CVSS Score: 9.6

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.