Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-108434
Published: November 5, 2026
Vulnerability identifier: #VU159354
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-2026-108434
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, potentially including small portions of heap memory.
The vulnerability exists due to an out-of-bounds read in Microsoft Office Word when processing attacker-controlled input. A remote attacker can supply specially crafted input that requires user interaction to trigger reads beyond the intended memory boundaries and potentially disclose small portions of heap memory.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-108434
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