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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").
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade python-marshmallow | Jul 30, 2024 | Sep 18, 2018 |
| Ubuntu | — | Upgrade python3-marshmallow (Ubuntu Pro)Upgrade python3-marshmallow-doc (Ubuntu Pro) | May 3, 2026 | Apr 30, 2026 |
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