CVE-2026-78509
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
- Published Sep 8, 2026
- CVSS 9.8 critical
- 1.0% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.