CVE-2026-16363

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 153 Firefox ESR versions prior to 140.13 Thunderbird versions prior to 153 Thunderbird versions prior to 140.13

Description A JIT miscompilation issue exists within the JavaScript: WebAssembly component. JIT (Just-In-Time) compilation is a method used by software to improve execution speed by compiling code during runtime rather than before execution.

Recommendations Update Firefox to version 153 or later. Update Firefox ESR to version 140.13 or later. Update Thunderbird to version 153 or later. Update Thunderbird to version 140.13 or later.