Out-of-bounds read in Microsoft products - CVE-2026-55023

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Main Vulnerability Database Vulnerabilities #VU138197

Out-of-bounds read in Microsoft products - CVE-2026-55023

Published: July 17, 2026


Vulnerability identifier: #VU138197
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-2026-55023
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Office
Microsoft SharePoint 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 when parsing a specially crafted Office file. A remote attacker can send a specially crafted file to disclose sensitive information.

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


How to mitigate CVE-2026-55023

Install security update from vendor's website.

Sources