In the marshmallow library before 2.15.1 and 3.x before 3.0.0b9 for Python, the schema "only" option treats an empty list as implying no "only" option, which allows a request that was intended to expose no fields to instead expose all fields (if the schema is being filtered dynamically using the "only" option, and there is a user role that produces an empty value for "only").
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| marshmallow(PyPI) | 0 | 2.15.1 | N/A |
| marshmallow(PyPI) | 3.0a0 | 3.0.0b9 | N/A |
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