CVE-2026-55039

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel (affected versions not specified)

Description An integer underflow (wrap or wraparound) occurs when an arithmetic operation results in a value smaller than the minimum representable value for the data type, causing it to wrap around to a very large positive number. This issue allows an unauthorized attacker to execute code locally when a specially crafted workbook is opened on a system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.