Multiple memory safety vulnerabilities were identified in various versions of Firefox and Thunderbird ESR and regular releases prior to their respective fixed versions. These bugs include memory corruption issues that could potentially be exploited to execute arbitrary code. The vulnerabilities affect Firefox versions before 142, Firefox ESR versions before 115.27, 128.14, and 140.2, and Thunderbird versions before 142, 128.14, and 140.2. Mozilla has released fixes in Firefox 142, Firefox ESR 115.27, 128.14, 140.2, and Thunderbird 142, 128.14, 140.2 to address these issues.