What’s Vulnerable › Vulnerabilities

CVE-2018-17175

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-09-18 · updated 2026-06-17

Description

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; from 3.0 before 3.0.0b9 — fixed in 2.15.1, 3.0.0b9

How to fix

Upgrade to a fixed version: Marshmallow Project Marshmallow 2.15.1, 3.0.0b9. Check the vendor advisory for mitigations.

References

• https://github.com/marshmallow-code/marshmallow/issues/772
• https://github.com/marshmallow-code/marshmallow/pull/777
• https://github.com/marshmallow-code/marshmallow/pull/782
• https://github.com/marshmallow-code/marshmallow/issues/772
• https://github.com/marshmallow-code/marshmallow/pull/777
• https://github.com/marshmallow-code/marshmallow/pull/782

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