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Title: gh-146196: Fix potential Undefined Behavior in _PyUnicodeWriter_WriteASCIIString by ashm-dev · Pull Request #146201 · python/cpython · GitHub

Open Graph Title: gh-146196: Fix potential Undefined Behavior in _PyUnicodeWriter_WriteASCIIString by ashm-dev · Pull Request #146201 · python/cpython

X Title: gh-146196: Fix potential Undefined Behavior in _PyUnicodeWriter_WriteASCIIString by ashm-dev · Pull Request #146201 · python/cpython

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Open Graph Description: _PyUnicodeWriter_WriteASCIIString Issue: Undefined Behavior in _PyUnicodeWriter_WriteASCIIString: NULL pointer passed to memcpy when len is 0 #146196

X Description: _PyUnicodeWriter_WriteASCIIString Issue: Undefined Behavior in _PyUnicodeWriter_WriteASCIIString: NULL pointer passed to memcpy when len is 0 #146196

Opengraph URL: https://github.com/python/cpython/pull/146201

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pythongh-145980https://github.com/python/cpython/issues/145980
pythonGH-145981https://github.com/python/cpython/pull/145981
pythongh-145754https://github.com/python/cpython/issues/145754
python#145756https://github.com/python/cpython/pull/145756
pythongh-145177https://github.com/python/cpython/issues/145177
python#146160https://github.com/python/cpython/pull/146160
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Apr 4, 2026 https://github.com/python/cpython/pull/146201#ref-pullrequest-3716338400
gh-130273: Fix traceback color output with unicode characters #142529 https://github.com/python/cpython/pull/142529
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Apr 25, 2026 https://github.com/python/cpython/pull/146201#ref-commit-be90080
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pythongh-146196https://github.com/python/cpython/issues/146196
: Fix Undefined Behavior in _PyUnicodeWriter_WriteASCI…https://github.com/ljfp/cpython/commit/be900801890e5570dc322286c5bad00b1685adfd
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python#146201https://github.com/python/cpython/pull/146201
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