Heap-based buffer overflow in Microsoft Office for macOS and Microsoft Office - CVE-2026-112728

Vulnerability details

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

The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Word when processing a specially crafted file. A remote attacker can trick a user into opening the file to execute arbitrary code on the affected system.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

How to mitigate CVE-2026-112728

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-112728
• https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office