marshmallow-code/marshmallow · Security
Marshmallow has DoS in Schema.load(many)
- GHSA ID
- GHSA-428g-f7cq-pgp5
- CVE ID
- CVE-2025-68480
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
# 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]
CWEs
- CWE-405 · Asymmetric Resource Consumption (Amplification)