{"id":"CVE-2026-107614","aliases":["EUVD-2026-94978","GHSA-v6fq-v4c3-2qr7","UBUNTU-CVE-2026-107614"],"status":"published","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00106,"percentile":0.0109,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125","CWE-191"],"published":"2026-10-08T13:39:58Z","modified":"2026-10-21T23:01:22Z","products":[{"vendor":"glavsoft","product":"tightvnc"},{"vendor":"kaspersky","product":"tightvnc"}],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1661/","tags":["issue-tracking","report"]},{"url":"https://www.tightvnc.com/whatsnew.php","tags":["release-notes","patch","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107614"},{"url":"https://sourceforge.net/p/vnc-tight/bugs/1661"},{"url":"https://github.com/advisories/GHSA-v6fq-v4c3-2qr7"},{"url":"https://ubuntu.com/security/CVE-2026-107614","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107614","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-107614","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.","status":"published","published":"2026-10-08T13:39:58.297Z","modified":"2026-10-08T14:01:01.624Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-191","CWE-125"],"updated_at":"2026-11-02T13:45:25.313702Z"}],"euvd":[{"id":"EUVD-2026-94978","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.","status":"published","published":"2026-10-08T13:39:58Z","modified":"2026-10-08T14:01:01Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T17:27:32.642438Z"}],"ghsa":[{"id":"GHSA-v6fq-v4c3-2qr7","title":"An integer underflow in WinCursorShapeUtils::trimTransparent() in GlavSoft TightVNC Server for...","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.","status":"published","published":"2026-10-08T15:32:59Z","modified":"2026-10-08T15:33:06Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:12:57.235839Z"}],"nvd":[{"id":"CVE-2026-107614","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.","status":"published","published":"2026-10-08T14:16:50.163Z","modified":"2026-10-08T21:10:00.133Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-125","CWE-191"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"UBUNTU-CVE-2026-107614","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.","status":"withdrawn","published":"2026-10-13T00:00:00Z","modified":"2026-10-21T23:01:22.266654247Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}