CVE-2026-107613

Medium

Description

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().

SeverityMedium

CVSS5.9

Exploit probability—

ProductTightVNC

PublishedOct 8, 2026

First seenOct 8, 2026

Weakness typeCWE-476NULL pointer dereference

How to fix

Update

GlavSoft TightVNC2.8.88 or later

Patches

tightvnc.com/whatsnew.php

Affected products

Product	Affected versions	Fixed in
GlavSoft TightVNC	v < 2.8.88	2.8.88

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