Crash report
What happened?
Reproducer:
import xml.etree.ElementTree as ET from copy import deepcopy class Evil(ET.Element): def __deepcopy__(self, memo): root.clear() return self root = ET.Element('a') root.append(Evil('x')) deepcopy(root)
CPython versions tested on:
CPython main branch
Operating systems tested on:
No response
Output from running 'python -VV' on the command line:
Python 3.14.0a7+ (heads/main:7f02ded29fb, Apr 26 2025, 14:29:01) [GCC 7.5.0]