{"id":"CVE-2026-107614","revision":"f3b966d454734f4cbab3ceb9e8951933","records":[{"revision":"f3b966d454734f4cbab3ceb9e8951933","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107614","aliases":[],"title":"Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read","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.","state":0,"publishedAt":"2026-10-08T13:39:58.297+00:00","modifiedAt":"2026-10-08T14:01:01.624+00:00","affected":[{"ecosystem":"Vendor product","name":"TightVNC","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"GlavSoft\",\n                    \"product\": \"TightVNC\",\n                    \"platforms\": [\n                        \"Windows\"\n                    ],\n                    \"modules\": [\n                        \"TightVNC Server (cursor shape processing)\"\n                    ],\n                    \"programFiles\": [\n                        \"WinCursorShapeUtils.cpp\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"WinCursorShapeUtils::trimTransparent()\"\n                        },\n                        {\n                            \"name\": \"getCursorHeight()\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.8.88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","score":6.1,"severity":"MEDIUM"}],"references":["https://sourceforge.net/p/vnc-tight/bugs/1661/","https://www.tightvnc.com/whatsnew.php"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107614","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107614","identifiers":["CVE-2026-107614"]},"retained":false,"historicalAffected":[]}],"coverage":[]}