CVE-2026-12296

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Firefox ESR versions prior to 140.12 Thunderbird versions prior to 152 Thunderbird versions prior to 140.12

Description A sandbox escape exists within the Security: Process Sandboxing component. A sandbox is a security mechanism for separating running programs, usually in an effort to mitigate the impact of a vulnerability by restricting the program's access to the rest of the system.

Recommendations Update Firefox to version 152. Update Firefox ESR to version 140.12. Update Thunderbird to version 152. Update Thunderbird to version 140.12.