CVE-2025-55199: helm DoS — Fix

Description

Helm is a package manager for Charts for Kubernetes. Prior to version 3.18.5, it is possible to craft a JSON Schema file in a manner which could cause Helm to use all available memory and have an out of memory (OOM) termination. This issue has been resolved in Helm 3.18.5. A workaround involves ensuring all Helm charts that are being loaded into Helm do not have any reference of $ref pointing to /dev/zero.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
helm	helm	< 3.18.5

References

Advisories & Patches

https://github.com/helm/helm/commit/b78692c18f0fb38fe5ba4571a674de067a4c53a5

Other References

https://github.com/helm/helm/security/advisories/GHSA-9h84-qmv7-982p

Frequently Asked Questions

What is CVE-2025-55199? +

Helm is a package manager for Charts for Kubernetes. Prior to version 3.18.5, it is possible to craft a JSON Schema file in a manner which could cause Helm to use all available memory and have an out of memory (OOM) termination. This issue has been resolved in Helm 3.18.5. A workaround involves ensuring all Helm charts that are being loaded into Helm do not have any reference of $ref pointing to /dev/zero. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-55199? +

CVE-2025-55199 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-55199? +

CVE-2025-55199 affects products from helm, specifically: helm. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55199? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-55199