DLL search order hijacking via screenhooks libraries in TightVNC Server
An uncontrolled search path element vulnerability in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to execute arbitrary code with SYSTEM privileges. DynamicLibrary::init() (and ThemeLib) load screenhooks32.dll / screenhooks64.dll with LoadLibrary() using a bare file name and no LOAD_LIBRARY_SEARCH_* flags, so the TightVNC service follows the default DLL search order and loads an attacker-planted DLL from a writable directory earlier in that order (for example, an installation directory with permissive ACLs).
CVE-2026-107615
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-2026-107615
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 (screen hooks loader)"
],
"product": "TightVNC",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.8.88",
"versionType": "custom"
}
],
"platforms": [
"Windows"
],
"programFiles": [
"DynamicLibrary.cpp",
"ThemeLib.cpp"
],
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "DynamicLibrary::init()"
}
]
}
]- Related CVEs
- CVE-2026-107615
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12509 · Revision 1
- Added to Heist Feed
- Publisher date