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Vulnerabilities

Security fix · CVE-2025-68480

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

Published Dec 22, 2025 · catalog updated Dec 22, 2025 · Marshmallow is a lightweight

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-68480. EPSS is 0.30%. Act only if a listed version of Marshmallow is a lightweight is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Marshmallow is a lightweight).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Version ranges on file
Affected products
vendor marshmallow-code marshmallow 4.0.0, < 4.1.2

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor marshmallow-code marshmallow 4.0.0, < 4.1.24.0.0, < 4.1.2

How to fix CVE-2025-68480

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-68480. EPSS is 0.30%. Act only if a listed version of Marshmallow is a lightweight is installed.

Which versions are affected?

Compare what you have installed with marshmallow-code marshmallow 4.0.0, < 4.1.2 4.0.0, < 4.1.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 22, 2025 · EUVD

    Detected

    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.

  2. Dec 22, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-68480

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-68480

    30-day exploitation probability 0.30%

    first.org
  • EUVDVulnerability recordEUVD-2025-204752

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 2, 2026
  • EUVDNov 1, 2026