The following code is for security research and authorized testing only.
python
# CVE-2026-20835 PoC - Out-of-bounds Read in camsvc
# This PoC demonstrates the vulnerability pattern (for educational purposes only)
import ctypes
from ctypes import wintypes
import struct
# Windows API definitions
kernel32 = ctypes.windll.kernel32
ntdll = ctypes.windll.ntdll
# Define necessary structures and constants
class UNICODE_STRING(ctypes.Structure):
_fields_ = [
("Length", wintypes.USHORT),
("MaximumLength", wintypes.USHORT),
("Buffer", ctypes.c_wchar_p)
]
# Open camsvc service handle
scm_handle = kernel32.OpenSCManagerW(None, None, 0xF003F)
if not scm_handle:
print("[-] Failed to open Service Control Manager")
exit(1)
# Open camsvc service
service_handle = kernel32.OpenServiceW(scm_handle, "camsvc", 0xF01FF)
if not service_handle:
print("[-] Failed to open camsvc service")
kernel32.CloseServiceHandle(scm_handle)
exit(1)
print("[+] camsvc service handle obtained successfully")
print("[+] Triggering potential out-of-bounds read condition...")
# The actual exploitation requires specific malformed requests to camsvc
# This PoC demonstrates the pattern - actual exploit needs further research
# Cleanup
kernel32.CloseServiceHandle(service_handle)
kernel32.CloseServiceHandle(scm_handle)
print("[+] Note: This is a proof-of-concept demonstrating the attack surface")
print("[+] Actual exploitation requires deeper analysis of camsvc interface")