Main Vulnerability Database Vulnerabilities #VU138242

Heap-based buffer overflow in Microsoft Office for macOS and Microsoft PowerPoint - CVE-2026-55043

Published: July 17, 2026

Vulnerability identifier: #VU138242

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-55043

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to heap-based buffer overflow in Microsoft Office PowerPoint when parsing a crafted Office file. A remote attacker can send a specially crafted Office file to execute arbitrary code.

User interaction is required to open the crafted file.

Affected software

Microsoft Office for macOS
Microsoft PowerPoint

How to mitigate CVE-2026-55043

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.111.26071215
Microsoft PowerPoint - update to 16.0.5561.1000

External References

Related Security Bulletins