CVE-2025-68480

Marshmallow has DoS in Schema.load(many)

Published Dec 22, 2025 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-428g-f7cq-pgp5 Marshmallow has DoS in Schema.load(many)
Ubuntu USN Ubuntu USN USN-8225-1 Python marshmallow vulnerabilities
History
Type Values Removed Values Added
First Time appeared Marshmallow Project
Marshmallow Project marshmallow
Vendors & Products Marshmallow Project
Marshmallow Project marshmallow
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Marshmallow has DoS in Schema.load(many)
Weaknesses CWE-405
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 22, 2025, 9:35 PM
Reserved
Dec 18, 2025, 6:29 PM
Status
Deferred
Published
Dec 22, 2025, 10:16 PM
Modified
Oct 19, 2026, 10:10 PM
Severity
Moderate
Public date
Dec 22, 2025, 9:20 PM