CVE-2026-70282

Summary

A heap-based buffer overflow in Microsoft Outlook allows remote attackers to execute arbitrary code when processing specially crafted email messages. This vulnerability could enable attackers to gain full control of affected systems.

Exploitability

Exploitation requires a user to open a malicious email attachment or view a crafted email message, making it moderately difficult to achieve without social engineering but possible over a network.

Blast radius

If exploited, this vulnerability could allow attackers to execute code on user workstations running affected Office versions, potentially leading to full system compromise and data exfiltration.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Deploy the Microsoft security update KB5042789 for Outlook 2021 and Outlook 2024, or upgrade to Microsoft 365 Apps for enterprise version 2408 or later.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.