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PyUnstable_Object_IsUniqueReferencedTemporary doesn't handle tagged ints properly #142589

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PyUnstable_Object_IsUniqueReferencedTemporary doesn't handle tagged ints properly#142589
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3.14bugs and security fixes3.15new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error
@colesbury

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@colesbury
colesbury
opened on Dec 11, 2025

Bug report

Noticed by @cmaloney in #141862

PyUnstable_Object_IsUniqueReferencedTemporary calls PyStackRef_AsPyObjectBorrow, which may trigger an assertion failure if a stack element is a tagged int.

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    3.14bugs and security fixes3.15new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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