Asymmetric Resource Consumption (Amplification) Affecting marshmallow package, versions [3.0.0rc1,3.26.2)[4.0.0,4.1.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-MARSHMALLOW-14550833
- published23 Dec 2025
- disclosed22 Dec 2025
- credit카푸치노
Introduced: 22 Dec 2025
CVE-2025-68480 (opens in a new tab)How to fix?
Upgrade marshmallow to version 3.26.2, 4.1.2 or higher.
Overview
Affected versions of this package are vulnerable to Asymmetric Resource Consumption (Amplification) via the Schema.load method of the error storage utility, when handling input with the many parameter set to True. An attacker can cause excessive CPU consumption by submitting a moderately sized request.
Workaround
This vulnerability can be mitigated by validating the input type before processing, such as ensuring the data is a list and failing fast if it is not.