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Fencer Vulns
medium 5.3

CVE-2025-68480 json

Marshmallow has DoS in Schema.load(many)

published 2025-12-22 10 mo ago modified 2026-10-19 20 d ago also EUVD-2025-204752 , GHSA-428g-f7cq-pgp5 , PYSEC-2026-1605

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi marshmallow 3.26.2, 4.1.2
  • marshmallow_project marshmallow 3.26.2, 4.1.2
  • python-marshmallow Debian 13 3.26.2-0+deb13u1
  • python-marshmallow Debian 14 3.26.2-0.1

debian advisories DEBIAN-CVE-2025-68480

  • python-marshmallow Ubuntu Pro 20.04 LTS 3.4.0-1ubuntu0.1~esm1
  • python-marshmallow Ubuntu Pro 22.04 LTS 3.13.0-1ubuntu0.1~esm1
  • python-marshmallow Ubuntu Pro 24.04 LTS 3.20.1-1.1ubuntu0.1~esm1
  • python-marshmallow Ubuntu Pro 26.04 LTS 3.26.1-0.4ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2025-68480

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-marshmallow SLES for SAP applications 16.0, SLES 16.0 3.20.2-160000.3.1
  • python-marshmallow SLE Module for Public Cloud 15 SP7, SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5 +2 more 3.20.2-150400.9.10.1

suse advisories SUSE-SU-2026:20130-1SUSE-SU-2026:0226-1

  • python-marshmallow openSUSE Leap 16.0 3.20.2-160000.3.1
  • python-marshmallow openSUSE Tumbleweed 3.26.2-1.1

opensuse advisories openSUSE-SU-2026:20087-1openSUSE-SU-2026:10003-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-68480 updated cvss 6.5

github.com/marshmallow-code/marshmallow: Marshmallow: Denial of Service via crafted request to Schema.load function

  • Red Hat Ansible Automation Platform 2 python-marshmallow, python3.11-marshmallow
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
pypi marshmallow
>=3.0.0rc1, <3.26.2
>=4.0.0, <4.1.2
3.26.2
4.1.2

Affected products

  • marshmallow-code marshmallow

Classification

Weakness
  • CWE-405 Asymmetric Resource Consumption (Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.