CVE-2026-107614: medium-severity vulnerability in GlavSoft TightVNC
Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read
Published
10Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1
exploitation probability
—
observed exploitation
nono source reports it
An integer underflow in WinCursorShapeUtils::trimTransparent() in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to crash the server, and potentially read out-of-bounds memory, by causing a cursor shape with a width or height of zero to be processed on the DXGI capture path. The loop bound width - 1 wraps to 0xFFFFFFFF, producing an access roughly 4 GB beyond the 64 KB cursor buffer; a monochrome cursor of height 1 also becomes 0 because getCursorHeight() halves the height in place.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Affected products
GlavSoft · TightVNCRelated CVEs — GlavSoft TightVNC
In the same product, most dangerous first.
CVE-2026-107615HIGHDLL search order hijacking via screenhooks libraries in TightVNC ServerEPSS —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 —