What’s Vulnerable › Vulnerabilities

CVE-2026-107613: NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-08
• Weakness: CWE-476

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().

Affected products

• GlavSoft TightVNC: before 2.8.88 — fixed in 2.8.88

How to fix

Upgrade to a fixed version: GlavSoft TightVNC 2.8.88. Check the vendor advisory for mitigations.

References

• https://sourceforge.net/p/vnc-tight/bugs/1660/
• https://www.tightvnc.com/whatsnew.php

Get alerted when CVE-2026-107613 or the next vulnerability affects your stack