CVE-2025-68480: Marshmallow-Code Marshmallow

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions from 3.0.0rc1 to before 3.26.2 and from 4.0.0 to before 4.1.2, Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. This issue has been patched in version 3.26.2 and 4.1.2.

Affected products

• Marshmallow-Code Marshmallow: from 3.0.0rc1, before 3.26.2 (fixed in 3.26.2); from 4.0.0, before 4.1.2 (fixed in 4.1.2)

Published 2025-12-22. Last modified 2026-06-17.