CVE-2025-1012

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 135 Firefox ESR versions prior to 115.20 Firefox ESR versions prior to 128.7 Thunderbird versions prior to 128.7 Thunderbird versions prior to 135

Description A race during concurrent delazification could have led to a use-after-free. This issue affects several versions of Firefox and Thunderbird.

Recommendations For Firefox versions prior to 135, update to version 135 or later. For Firefox ESR versions prior to 115.20, update to version 115.20 or later. For Firefox ESR versions prior to 128.7, update to version 128.7 or later. For Thunderbird versions prior to 128.7, update to version 128.7 or later. For Thunderbird versions prior to 135, update to version 135 or later.