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]

Linked PRs

• gh-133009: fix UAF in xml.etree.ElementTree.Element.__deepcopy__ #133010
• [3.14] gh-133009: fix UAF in xml.etree.ElementTree.Element.__deepcopy__ (GH-133010) #133805
• [3.13] gh-133009: fix UAF in xml.etree.ElementTree.Element.__deepcopy__ (GH-133010) #133806