Multiple memory safety bugs were present in Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140, and Thunderbird 140. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The vulnerabilities were fixed in Firefox ESR 128.13, Thunderbird ESR 128.13, Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141, and Thunderbird 141.