Stack-based buffer overflow in Microsoft Office - CVE-2026-97012

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the client system.

The vulnerability exists due to a stack-based buffer overflow in Microsoft Office Outlook when processing responses from a malicious server. A remote attacker can host a malicious server and convince a user to connect to it from an affected client to execute arbitrary code on the client system.

Affected software

How to mitigate CVE-2026-97012

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-97012
• https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office