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CVE-2025-68480 — Marshmallow has DoS in Schema.load(many)

2026-10-01T15:57:52.922028+00:00

Affected: marshmallow-code marshmallow

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.

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

2026-10-01T15:57:52.922167+00:00

Affected: PyPI: marshmallow

### 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] ```

PYSEC-2026-1605 — Marshmallow has DoS in Schema.load(many)