Medium severity · published Oct 8, 2026
CVE-2026-107613
NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization
5.9
CVSS
0.3%
EPSS
No
On KEV
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().
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TI
TightVNC · GlavSoft
before 2.8.88 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107613
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107613
issue-tracking
https://sourceforge.net/p/vnc-tight/bugs/1660/
release-notes
https://www.tightvnc.com/whatsnew.php
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