CVE-2026-107613: Glavsoft Tightvnc

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().

Affected products

• Glavsoft Tightvnc: before 2.8.88 (fixed in 2.8.88)

Published 2026-10-08. Last modified 2026-10-08.