GitHub Advisoryadvisory · PyPI

GHSA-428g-f7cq-pgp5 Marshmallow has DoS in Schema.load(many)

MEDIUM Published 2025-12-22 Modified 2025-12-23 Official page ↗
Aliases
CVE-2025-68480
Ecosystem
PyPI
Packages
marshmallow
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-405
Reviewed
2025-12-22

Affected packages

• PyPI marshmallow: >= 3.0.0rc1, < 3.26.2 → fixed in 3.26.2 • PyPI marshmallow: >= 4.0.0, < 4.1.2 → fixed in 4.1.2

Description

Impact `Schema.load(data, many=True)` is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. Patches 4.1.2, 3.26.2 Workarounds ```py Fail fast def load_many(schema, data, kwargs): if not isinstance(data, list): raise ValidationError(['Invalid input type.']) return [schema.load(item, kwargs) for item in data] ```

Related

Alias · CVE (1)

  • CVE-2025-68480 Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. vulnerability

Weakness · CWE (1)

  • CWE-405 Asymmetric Resource Consumption (Amplification) weakness

References