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UAF:xml.etree.ElementTree.Element.__deepcopy__ when concurrent mutations happen #133009

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picnixz
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extension-modulesC modules in the Modules dirtopic-XMLtype-crashA hard crash of the interpreter, possibly with a core dump
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Crash report

What happened?

Reproducer:

importxml.etree.ElementTreeasETfromcopyimportdeepcopyclassEvil(ET.Element):def__deepcopy__(self,memo):root.clear()returnselfroot=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]

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extension-modulesC modules in the Modules dirtopic-XMLtype-crashA hard crash of the interpreter, possibly with a core dump

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