Out-of-bounds read in Microsoft Office - CVE-2026-63529
Published: August 12, 2026
Vulnerability identifier: #VU141938
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-2026-63529
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 out-of-bounds read in Microsoft Office when parsing a crafted Office file. A remote attacker can send a specially crafted file to the victim to disclose sensitive information.
User interaction is required to open or preview the crafted file, and the Preview Pane can be used as an attack vector.
Affected software
Microsoft Office
How to mitigate CVE-2026-63529
Install security update from vendor's website.
Microsoft Office - update to 16.0.5565.1001