Multiple memory safety bugs were present in Firefox 131, Firefox ESR 128.3, and Thunderbird 128.3. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. Mozilla fixed these vulnerabilities in Firefox 132, Firefox ESR 128.4, and Thunderbird 128.4. The vulnerabilities have a high severity with a CVSS score of 9.8. Additional related vulnerabilities with varying impacts were also addressed in the same updates.