CVE-2025-32387: Helm Allows A Specially Crafted JSON Schema To Cause A Stack Overflow
First published: Wed Apr 09 2025(Updated: )
A Helm contributor discovered that a specially crafted JSON Schema within a chart can lead to a stack overflow. ### Impact A JSON Schema file within a chart can be crafted with a deeply nested chain of references, leading to parser recursion that can exceed the stack size limit and trigger a stack overflow. ### Patches This issue has been resolved in Helm v3.17.3. ### Workarounds Ensure that the JSON Schema within any charts loaded by Helm does not have a large number of nested references. These JSON Schema files are larger than 10 MiB. ### For more information Helm's security policy is spelled out in detail in our [SECURITY](https://github.com/helm/community/blob/master/SECURITY.md) document. ### Credits Disclosed by Jakub Ciolek at AlphaSense.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Helm | <3.17.3 | |
| go/helm.sh/helm/v3 | <3.17.3 | 3.17.3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-32387?
CVE-2025-32387 has a high severity due to the potential for a stack overflow caused by deeply nested references.
How do I fix CVE-2025-32387?
To fix CVE-2025-32387, update Helm to version 3.17.3 or later.
What causes CVE-2025-32387?
CVE-2025-32387 is caused by a JSON Schema file within a chart being crafted with excessive nested references.
Which versions of Helm are affected by CVE-2025-32387?
Helm versions prior to 3.17.3 are affected by CVE-2025-32387.
Is there a workaround for CVE-2025-32387?
There are no known workarounds for CVE-2025-32387 other than upgrading to the patched version.
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