CVE-2018-17175: Marshmallow Project Marshmallow

Medium severity, CVSS 5.3. EPSS: 1.9% chance of exploitation in the next 30 days.

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").

Affected products

• Marshmallow Project Marshmallow: before 2.15.1 (fixed in 2.15.1); from 3.0, before 3.0.0b9 (fixed in 3.0.0b9)

Published 2018-09-18. Last modified 2026-06-17.