CVE-2026-55043 Details

A heap-based buffer overflow vulnerability has been identified in Microsoft Office PowerPoint. This vulnerability allows an unauthorized attacker to execute code locally. It affects several different versions and editions of PowerPoint, including the 2016 32-bit and 64-bit editions, Office LTSC for Mac 2021 and 2024, and various Microsoft 365 Apps for Enterprise editions. The vulnerability arises from an integer overflow or wraparound, leading to the buffer overflow condition.

Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Microsoft Office LTSC for Mac 2021 and 2024, the security update is available via the Mac App Store. Microsoft 365 Apps for Enterprise users can also download the security update through the Microsoft Update Catalog.