Buffer over-read in Microsoft Office for macOS and Microsoft Office - CVE-2026-108454
Published: November 5, 2026
Vulnerability identifier: #VU159374
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108454
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information from heap memory.
The vulnerability exists due to a buffer over-read in Microsoft Office PowerPoint when processing content. A remote attacker can trick a victim into processing specially crafted content to potentially read small portions of heap memory.
The Preview Pane is an attack vector for this vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-108454
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.114 26101123
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056