Home/CVE/Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions fro
CVE

CVE-2025-68480

Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions fro

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.

MEDIUM · CVSS 5.3 EPSS 0.00106
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-405Asymmetric Resource Consumption (Amplification)
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI marshmallow MODERATE fixed in 3.26.2
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Dec 2025 · 10:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
usnUSN-8225-1
suse-csafopenSUSE-SU-2026:20087-1
suse-csafSUSE-SU-2026:0226-1
suse-csafSUSE-SU-2026:20130-1
suse-csafopenSUSE-SU-2026:10003-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/marshmallow-code/marshmallow/commit/d24a0c9df061c4daa92f71cf85aca25b83eee508
https://github.com/marshmallow-code/marshmallow/security/advisories/GHSA-428g-f7cq-pgp5
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