CVE-2026-73075 Vim: Out-of-bounds Access in Popup Opacity Handling

Vim is an open source, command line text editor. From 9.2.0469 until 9.2.0843, popupmarkopacityzindex in src/popupwin.c can use a negative wwinrow for a text-property-anchored popup with clipwindow and opacity, indexing before the screen array instead of accounting for wpopuptopoff and causing an...