CVE-2026-74944: firefox: thunderbird: Use-after-free in the DOM: Core & HTML component

Severity: Critical

CVSS Score: 9.8

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.