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

CVE-2026-107613

NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
GlavSoft / TightVNC	affected 0 before 2.8.88

CWE

CWE-476

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.