CVE-2026-109709

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 158 Firefox ESR versions prior to 153.5 Thunderbird versions prior to 158 Thunderbird versions prior to 153.5

Description An issue exists in the Security: Process Sandboxing component that allows for information disclosure and privilege escalation. Process sandboxing is a security mechanism that isolates running processes to prevent them from accessing unauthorized system resources.

Recommendations Update Firefox to version 158. Update Firefox ESR to version 153.5. Update Thunderbird to version 158. Update Thunderbird to version 153.5.