CVE-2026-124864

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 160 Firefox ESR versions prior to 115.45 Firefox ESR versions prior to 153.7 Thunderbird versions prior to 160

Description A use-after-free issue exists in the DOM: Service Workers component, which can lead to a sandbox escape. A sandbox is a security mechanism for separating running programs, and a use-after-free occurs when an application continues to use a pointer after it has been freed, potentially allowing for arbitrary code execution.

Recommendations Update Firefox to version 160 or later. Update Firefox ESR to version 115.45 or later. Update Firefox ESR to version 153.7 or later. Update Thunderbird to version 160 or later.