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CVE-2026-35204 — Helm has a path traversal in helm.sh/helm/v4 —...

HIGH

Helm has a path traversal in plugin metadata version enables arbitrary file write outside Helm plugin directory

Published April 10, 2026Updated September 10, 2026Source: osv

Summary

Helm is a package manager for Charts for Kubernetes. In Helm versions >=4.0.0 and <=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. ### Impact A Helm user who installs or updates a plugin that is specially crafted can cause Helm to attempt to write the content of the affected plugin to an arbitrary location on the user's filesystem. Impacted users risk potentially overwriting user and system files which may further compromise the integrity of a system. ### Patches This issue has been patched in Helm v4.1.4 Installing/updating a plugin with a non-SemVer version (which excludes path traversal patterns) will result in an error. ### Workarounds Validate that the `plugin.yaml` of the Helm plugin does not include a `version:` field containing POSIX dot-dot path separators ie. "`/../`".

Advisory Timeline

  • First published April 10, 2026 (185 days ago).
  • Last revised September 10, 2026 — 153 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update helm.sh/helm/v4 to 4.1.4 or later
go get helm.sh/helm/v4@v4.1.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
helm.sh/helm/v4
go
All versions4.1.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.6 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-35204?
Helm has a path traversal in plugin metadata version enables arbitrary file write outside Helm plugin directory This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.6/10).
How do I check if my project is affected by CVE-2026-35204?
CVE-2026-35204 affects helm.sh/helm/v4. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-35204 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.6

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-vmx8-mqv2-9gmg
BIT-helm-2026-35204
GO-2026-5666

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