Multiple memory safety bugs were identified in Firefox 130, Firefox ESR 115.15, Firefox ESR 128.2, and Thunderbird 128.2. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The vulnerabilities have been fixed in Firefox 131, Firefox ESR 115.16, Firefox ESR 128.3, Thunderbird 131, and Thunderbird 128.3. The CVSS score is 9.8, indicating critical severity. No known exploits in the wild have been reported at this time.