CVE-2026-4696: firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component

Severity: Critical

CVSS Score: 9.8

Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.