Out-of-bounds read in Microsoft products - CVE-2026-55046

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU138195

Out-of-bounds read in Microsoft products - CVE-2026-55046

Published: July 17, 2026


Vulnerability identifier: #VU138195
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55046
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Excel
Office Online Server

Detailed vulnerability description

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in Microsoft Office Excel when parsing a crafted Office file. A remote attacker can send a specially crafted Office file to a user and convince them to open it to disclose sensitive information.

The disclosed information is limited to local memory addresses. User interaction is required, and the Preview Pane is not an attack vector.


How to mitigate CVE-2026-55046

Install security update from vendor's website.

Sources