Multiple memory safety bugs were present in Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143, and Thunderbird 143. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The vulnerabilities were fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird ESR 140.4, and Thunderbird 144. The CVSS score for this issue is 8.8, indicating high severity.