Heap-based buffer overflow in Microsoft Office - CVE-2026-105599

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in Microsoft Office PowerPoint when processing a malicious Office file. A remote attacker can send a malicious Office file to a user and convince them to open it to execute arbitrary code.

Successful exploitation requires a deep understanding of the system and depends on factors such as the environment, system configuration, and additional security measures.

Affected software

How to mitigate CVE-2026-105599

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-105599
• https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows