CVE-2025-68480
December 22, 2025
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 Packages
https://github.com/marshmallow-code/marshmallow.git (GITHUB):
Affected version(s) >=4.0.0 <4.1.2Fix Suggestion:
Update to version 4.1.2https://github.com/marshmallow-code/marshmallow.git (GITHUB):
Affected version(s) >=3.0.0rc1 <3.26.2Fix Suggestion:
Update to version 3.26.2marshmallow (PYTHON):
Affected version(s) >=3.0.0rc1 <3.26.2Fix Suggestion:
Update to version 3.26.2marshmallow (PYTHON):
Affected version(s) >=4.0.0 <4.1.2Fix Suggestion:
Update to version 4.1.2Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Asymmetric Resource Consumption (Amplification)
EPSS
Base Score:
0.06
