What is GHSA-c4jj-c6x2-r973?

GHSA-c4jj-c6x2-r973 is a security advisory published by GitHub Security Advisories with Medium severity. A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC...

Which CVE IDs does GHSA-c4jj-c6x2-r973 cover?

GHSA-c4jj-c6x2-r973 covers the following CVE IDs: CVE-2026-107613. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-c4jj-c6x2-r973?

GHSA-c4jj-c6x2-r973 has a CVSS v3 base score of 5.9, published by GitHub Security Advisories.

GHSA-c4jj-c6x2-r973MediumCVSS 5.9

A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC...

Vendor

GitHub Security Advisories

Published

October 8, 2026

Last Modified

October 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-107613 →

📋 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().

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-107613
https://sourceforge.net/p/vnc-tight/bugs/1660
https://www.tightvnc.com/whatsnew.php
https://github.com/advisories/GHSA-c4jj-c6x2-r973