NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization
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().
CVE-2026-107613
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107613
TightVNC
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "GlavSoft",
"modules": [
"TightVNC Server (Win8/DXGI screen driver)"
],
"product": "TightVNC",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.8.88",
"versionType": "custom"
}
],
"platforms": [
"Windows"
],
"programFiles": [
"Win8ScreenDriver.cpp"
],
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "Win8ScreenDriver::applyNewScreenProperties()"
},
{
"name": "Win8ScreenDriver::executeDetection()"
},
{
"name": "Win8ScreenDriver::getScreenBuffer()"
},
{
"name": "Win8ScreenDriver::grabFb()"
},
{
"name": "Win8ScreenDriver::getScreenPropertiesChanged()"
},
{
"name": "Win8ScreenDriver::getCursorPosition()"
}
]
}
]- Related CVEs
- CVE-2026-107613
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12507 · Revision 1
- Added to Heist Feed
- Publisher date