An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in Xcode 26.4. An app may be able to cause unexpected system termination.
The following code is for security research and authorized testing only.
python
// PoC for CVE-2026-28890 (Conceptual)
// This code demonstrates a buffer over-read scenario causing a crash.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void simulate_oob_read() {
char small_buffer[10];
char large_data[100];
memset(large_data, 'A', sizeof(large_data));
// Vulnerability: Copying more data than the buffer can hold or reading beyond bounds
// In a real scenario, this would be inside a parsing function of Xcode
printf("Attempting to read out of bounds...\n");
// Simulating the read that causes system termination
strncpy(small_buffer, large_data, 100); // OOB write/read trigger
printf("Buffer: %s\n", small_buffer);
}
int main() {
simulate_oob_read();
return 0;
}