CVE-2025-4091

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 138 Firefox ESR versions prior to 128.10 Thunderbird versions prior to 138 Thunderbird ESR versions prior to 128.10

Description Memory safety bugs are present, showing evidence of memory corruption. It is presumed that with enough effort, some of these bugs could be exploited to run arbitrary code.

Recommendations For Firefox versions prior to 138, update to version 138 or later. For Firefox ESR versions prior to 128.10, update to version 128.10 or later. For Thunderbird versions prior to 138, update to version 138 or later. For Thunderbird ESR versions prior to 128.10, update to version 128.10 or later.