CVE-2026-109708

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 A sandbox escape exists in the Networking component caused by incorrect boundary conditions. A sandbox is a security mechanism used to isolate running applications from the rest of the system to prevent malicious code from accessing sensitive data or 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.