CVE-2026-100781

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 115.42 Firefox ESR versions prior to 140.17 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157

Description A sandbox escape exists in the Graphics: WebRender 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 157 or later. Update Firefox ESR to version 115.42 or later. Update Firefox ESR to version 140.17 or later. Update Firefox ESR to version 153.4 or later. Update Thunderbird to version 157 or later.