CVE-2026-107615: high-severity vulnerability in GlavSoft TightVNC
DLL search order hijacking via screenhooks libraries in TightVNC Server
Published
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8
exploitation probability
—
observed exploitation
nono source reports it
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).
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
GlavSoft · TightVNCRelated CVEs — GlavSoft TightVNC
In the same product, most dangerous first.
CVE-2026-107614MEDIUMInteger underflow in TightVNC Server cursor shape trimming leads to out-of-bounds readEPSS —CVE-2026-107613MEDIUMNULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initializationEPSS —CVE-2026-107612HIGHWorld-accessible IPC shared memory with predictable name in TightVNC ServerEPSS —CVE-2026-107611HIGHOut-of-bounds read in TightVNC Viewer ZRLE palette decodingEPSS —