Heap-Based Buffer Overflow in Microsoft Office Outlook by Microsoft

CVE-2026-78509

What is CVE-2026-78509?

A vulnerability in Microsoft Office Outlook introduces a heap-based buffer overflow, which can be exploited by an unauthorized attacker to execute arbitrary code across a network. The flaw can lead to potential data loss and system compromise if left unaddressed. Microsoft has issued an advisory detailing the nature of the vulnerability and providing guidance on patching affected versions.

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