What’s Vulnerable › Vulnerabilities

CVE-2025-68480: Marshmallow has DoS in Schema.load(many)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-22 · updated 2026-10-19
• Weakness: CWE-405

Description

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 products

• marshmallow-code marshmallow: from 3.0.0rc1, < 3.26.2; from 4.0.0, < 4.1.2

References

• https://github.com/marshmallow-code/marshmallow/commit/d24a0c9df061c4daa92f71cf85aca25b83eee508
• https://github.com/marshmallow-code/marshmallow/security/advisories/GHSA-428g-f7cq-pgp5

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