CVE-2026-117881

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 159 Firefox ESR versions prior to 115.44 Firefox ESR versions prior to 153.6 Thunderbird versions prior to 159 Thunderbird versions prior to 153.6

Description A use-after-free issue exists within the DOM: Core and HTML component. A use-after-free occurs when an application continues to use a pointer after it has been freed, which can lead to crashes or arbitrary code execution.

Recommendations Update Firefox to version 159. Update Firefox ESR to version 115.44. Update Firefox ESR to version 153.6. Update Thunderbird to version 159. Update Thunderbird to version 153.6.