---
id: CVE-2026-35205
aliases:
  - GHSA-q5jf-9vfq-h4h7
  - BIT-helm-2026-35205
  - GO-2026-5566
title: >-
  Helm's plugin verification fails open when .prov is missing, allowing unsigned
  plugin install
summary: >-
  Helm's plugin verification fails open when .prov is missing, allowing unsigned
  plugin install
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
vendor: helm
product: helm.sh/helm/v4
ecosystem: go
affected:
  - 'helm.sh/helm/v4 >= 4.0.0, < 4.1.4'
patched:
  - helm.sh/helm/v4 4.1.4
published: '2026-04-10'
updated: '2026-07-24'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-q5jf-9vfq-h4h7'
references:
  - url: 'https://github.com/helm/helm/security/advisories/GHSA-q5jf-9vfq-h4h7'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35205'
  - url: >-
      https://github.com/helm/helm/commit/05fa37973dc9e42b76e1d2883494c87174b6074f
  - url: 'https://github.com/helm/helm'
  - url: 'https://github.com/helm/helm/releases/tag/v4.1.4'
  - url: 'https://helm.sh/docs/topics/provenance/#the-provenance-file'
tags:
  - osv
  - go
epss: 0.0022
epssPercentile: 0.12846
ingestedAt: '2026-07-25T19:08:11.839Z'
---

## Overview

Helm is a package manager for Charts for Kubernetes. In Helm versions >=4.0.0 and <=4.1.3, Helm will install plugins missing provenance (`.prov` file) when signature verification is required.

### Impact

The bug allows plugin authors to omit provenance (signing) data from plugins, bypassing plugin signature verification upon plugin install/update.

Notably, plugin hooks will be executed as designed on the installed plugin, enabling a malicious plugin to execute arbitrary code.

### Patches

This issue has been patched in Helm v4.1.4

Installing/updating a plugin with missing provenance will error if signature verification is required.

### Workarounds

Users may manually validate that a plugin archive is not missing provenance data (`.prov` file) before installation.

## Affected packages

- `helm.sh/helm/v4 >= 4.0.0, < 4.1.4`

## Remediation

Upgrade to a patched release:

- `helm.sh/helm/v4 4.1.4`