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

December 22, 2025 (updated December 23, 2025)

Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time.

References

github.com/advisories/GHSA-428g-f7cq-pgp5
github.com/marshmallow-code/marshmallow
github.com/marshmallow-code/marshmallow/commit/d24a0c9df061c4daa92f71cf85aca25b83eee508
github.com/marshmallow-code/marshmallow/security/advisories/GHSA-428g-f7cq-pgp5
nvd.nist.gov/vuln/detail/CVE-2025-68480

Code Behaviors & Features

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