CVE-2026-107613 NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization
An attacker can crash the TightVNC Server by triggering a null pointer dereference during DXGI re-initialization failures, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107613?
CVE-2026-107613 is a medium-severity vulnerability in GlavSoft TightVNC, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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().
Weakness: CWE-476
Which versions are affected by CVE-2026-107613?
How do I fix CVE-2026-107613?
No fix has been published for CVE-2026-107613 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107613 being exploited?
There is no known exploitation of CVE-2026-107613 in the wild and no public exploit code.
Sources
Also known as GHSA-c4jj-c6x2-r973.