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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107613
StatePUBLISHED
Assignersecurin
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 14:16:50 UTC
Updated2026-10-08 15:17:45 UTC
DescriptionA 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().

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from 33c584b5-0579-4c06-b2a0-8d8329fcab9c

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.133c584b5-0579-4c06-b2a0-8d8329fcab9cSecondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GlavSoft TightVNC affected 2.8.88 custom Windows

References

ReferenceSourceLinkTags
sourceforge.net/p/vnc-tight/bugs/1660 33c584b5-0579-4c06-b2a0-8d8329fcab9c sourceforge.net
www.tightvnc.com/whatsnew.php 33c584b5-0579-4c06-b2a0-8d8329fcab9c www.tightvnc.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Arjun Basnet from Securin (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-30T00:00:00.000ZReported to GlavSoft
CNA2026-06-02T00:00:00.000ZVendor acknowledged
CNA2026-06-19T00:00:00.000ZTightVNC 2.8.88 released with fix

Solutions

CNA: Upgrade TightVNC for Windows to version 2.8.88 or later.

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