CVE-2026-107614: CWE-191 Integer Underflow (Wrap or Wraparound) in GlavSoft TightVNC
Description
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 v3.1
Score 6.1medium
Affected software
GlavSoft
TightVNC
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- securin
- Date Reserved
- 2026-10-08T13:23:07.677Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac7a2d82cdf04f6561cce99
Added to database: 10/08/2026, 14:04:08 UTC
Last updated: 10/08/2026, 14:04:08 UTC
Views: 1
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