{"id":"CVE-2026-107614","published":"2026-10-08T14:16:50.163","lastModified":"2026-10-08T21:10:00.133","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.","cvssScore":6.1,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","cwes":["CWE-125","CWE-191"],"vendors":[],"products":[],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1661/","tags":[]},{"url":"https://www.tightvnc.com/whatsnew.php","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}