CVE-2026-3787: UltraVNC Windows Service cryptbase.dll uncontrolled search path
A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library cryptbase.dll of the component Windows Service. This manipulation causes uncontrolled search path. The attack requires local access. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-3787?
CVE-2026-3787 has been classified as a medium severity vulnerability due to its potential exploitation by local attackers.
How do I fix CVE-2026-3787?
To fix CVE-2026-3787, update UltraVNC to the latest version that addresses this uncontrolled search path issue.
Who is affected by CVE-2026-3787?
CVE-2026-3787 affects users of UltraVNC 1.6.4.0 running on Windows operating systems.
What type of vulnerability is CVE-2026-3787?
CVE-2026-3787 is an uncontrolled search path vulnerability which can lead to potential code execution.
What can an attacker do with CVE-2026-3787?
An attacker can exploit CVE-2026-3787 to manipulate the loading of the cryptbase.dll library, potentially executing arbitrary code.