IDA 9.3 b1 macOS arm64 UAF crash

IDA General Bugs
2

I traced it down, and it was my fault – idapythonrc.py:

import os
import sys
import site

print("[idapythonrc.py] Starting initialization...")

# Enable PyQt5 compatibility shim (IDA 9.2 uses PySide6 by default)
os.environ["IDAPYTHON_USE_PYQT5_SHIM"] = "1"
print(f"[idapythonrc.py] Set IDAPYTHON_USE_PYQT5_SHIM={os.environ.get('IDAPYTHON_USE_PYQT5_SHIM')}")

# IDA's Python directory with built-in modules (PyQt5, PySide6)
ida_python_dir = "/Applications/IDA Professional 9.2.app/Contents/MacOS/python"

# Ensure IDA's Python modules are accessible (they should be by default)
if ida_python_dir not in sys.path:
    sys.path.insert(0, ida_python_dir)

# Add the virtual environment's site-packages to sys.path
# Use append instead of insert so IDA's built-in modules take precedence
ida_venv = os.path.join(os.path.expanduser("~"), ".idapro", "pythonvenv")
site_packages = os.path.join(ida_venv, "lib", "python3.13", "site-packages")
if os.path.exists(site_packages):
    sys.path.append(site_packages)
    print(f"[idapythonrc.py] Added venv site-packages: {site_packages}")

print("[idapythonrc.py] Initialization complete.")

Note the ida_python_dir – the python integration was actually loading libshiboken6.abi3.6.8.dylib from IDA 9.2’s python path. Apparently the library has changed its ABI slightly enough in 9.3 b1 (custom patches?) for it to be compatible enough with IDA 9.2’s variant for it to work … most of the time.

Apologies for the noise.