Integer overflow in Microsoft products - CVE-2026-55026

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Main Vulnerability Database Vulnerabilities #VU138201

Integer overflow in Microsoft products - CVE-2026-55026

Published: July 17, 2026


Vulnerability identifier: #VU138201
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-2026-55026
CWE-ID: CWE-190
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 integer overflow or wraparound in Microsoft Office for macOS when parsing a crafted file. A remote attacker can trick the victim into opening a specially crafted file to disclose sensitive information.

The disclosed information is limited to small portions of heap memory. The Preview Pane is not an attack vector.


How to mitigate CVE-2026-55026

Install security update from vendor's website.

Sources