Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-108455
Published: November 5, 2026
Vulnerability identifier: #VU159375
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-2026-108455
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in Microsoft Office PowerPoint when processing crafted presentation content. A remote attacker can trick a victim into opening a specially crafted presentation to read small portions of heap memory.
The Preview Pane is also an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-108455
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