BUG: Fix MultiIndex alignment issue in Dataframe-Series binary operation in case of different levels

Author: snitish

doc/source/whatsnew/v3.0.0.rst

@@ -705,6 +705,7 @@ MultiIndex
 - :meth:`MultiIndex.insert` would not insert NA value correctly at unified location of index -1 (:issue:`59003`)
 - :func:`MultiIndex.get_level_values` accessing a :class:`DatetimeIndex` does not carry the frequency attribute along (:issue:`58327`, :issue:`57949`)
 - Bug in :class:`DataFrame` arithmetic operations in case of unaligned MultiIndex columns (:issue:`60498`)
+- Bug in :class:`DataFrame` arithmetic operation with :class:`Series` in case of unaligned MultiIndex (:issue:`61009`)
 -
 
 I/O

pandas/core/generic.py

@@ -9636,10 +9636,7 @@ def _align_series(
 
             left = self._constructor_from_mgr(fdata, axes=fdata.axes)
 
-            if ridx is None:
-                right = other.copy(deep=False)
-            else:
-                right = other.reindex(join_index, level=level)
+            right = other._reindex_indexer(join_index, ridx)
 
         # fill
         fill_na = notna(fill_value)