Multiple memory safety bugs were identified in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The vulnerabilities have been fixed in Firefox 136, Thunderbird 136, Firefox ESR 115.21, Firefox ESR 128.8, and Thunderbird 128.8. The CVSS score for this issue is 7.5, indicating high severity. No known exploits in the wild have been reported. The vendor has released official patches addressing these issues.