CVE-2006-4138: Microsoft Help File Viewer

High severity, CVSS 7.6. EPSS: 20.1% chance of exploitation in the next 30 days.

Multiple unspecified vulnerabilities in Microsoft Windows Help File viewer (winhlp32.exe) allow user-assisted attackers to execute arbitrary code via crafted HLP files.

Affected products

• Microsoft Help File Viewer: any version

Published 2006-08-14. Last modified 2026-06-16.