CVE-2026-2764: firefox: thunderbird: JIT miscompilation, use-after-free in the JavaScript Engine: JIT component

Severity: Critical

CVSS Score: 9.8

JIT miscompilation, use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.