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Advisory record · GHSA-428g-f7cq-pgp5

Marshmallow has DoS in Schema.load(many)

CVSS 5.3 MediumEPSS 0.0030 · 22nd percentile

Published by the GitHub Advisory Database at 22 Dec 2025, 20:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
marshmallowPyPI>=3.0.0rc1, <3.26.2 || >=4.0.0, <4.1.23.26.2, 4.1.2
Identifiers
GHSA-428g-f7cq-pgp5 · CVE-2025-68480 · PYSEC-2026-1605
Weakness (CWE)
CWE-405
Tags
Published
22 Dec 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Marshmallow versions 3.0.0rc1 up to 3.26.2 and 4.0.0 up to 4.1.2 are affected. A moderately sized input passed to Schema.load with many=True can consume a disproportionate amount of CPU time, enabling a denial of service attack. Upgrade to marshmallow 3.26.2 or 4.1.2. The source gives few details about the attack conditions.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0030, the 22nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:34 UTC First seen by agentprime
  2. 31 Oct 2026, 14:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.