The following code is for security research and authorized testing only.
python
/*
* PoC for CVE-2026-35421 (Conceptual)
* This simulates the heap overflow condition in Windows GDI.
* Note: Actual exploitation requires bypassing mitigations like ASLR and DEP.
*/
#include <windows.h>
#include <stdio.h>
int main() {
// Allocate a buffer simulating the vulnerable GDI object
HANDLE hHeap = GetProcessHeap();
char* vulnerable_buffer = (char*)HeapAlloc(hHeap, 0, 100);
if (vulnerable_buffer == NULL) {
printf("Memory allocation failed.\n");
return 1;
}
// Malicious input designed to overflow the heap buffer
// In a real exploit, this would be crafted to control EIP/RIP
char malicious_payload[200];
memset(malicious_payload, 0x41, sizeof(malicious_payload)); // Fill with 'A'
printf("Simulating trigger for CVE-2026-35421...\n");
// Trigger the overflow (Vulnerable function simulation)
// memcpy(vulnerable_buffer, malicious_payload, sizeof(malicious_payload));
// Cleanup
HeapFree(hHeap, 0, vulnerable_buffer);
printf("PoC execution completed.\n");
return 0;
}