CVE-2020-15186: 
Helm vulnerability analysis and mitigation

A security vulnerability (CVE-2020-15186) was discovered in Helm versions before 2.16.11 and 3.3.2. The vulnerability relates to improper sanitization of plugin names, which could allow malicious plugin authors to cause unexpected behavior. The issue was discovered by security researchers at Trail of Bits and was disclosed on September 17, 2020 (GitHub Advisory).

The vulnerability stems from insufficient validation of plugin names in Helm's plugin management system. Plugin names were not properly sanitized, allowing characters outside the acceptable range of [a-zA-Z0-9._-]. This could lead to plugin name spoofing or duplication. The vulnerability has been assigned a CVSS v3.1 score of 4.7 (Medium) (NVD).

The vulnerability could allow a malicious plugin author to create plugins with manipulated names that could result in two types of attacks: duplicating the name of another plugin or spoofing the output displayed in helm --help. This could potentially lead to confusion or misrepresentation of plugin functionality (GitHub Advisory).

The vulnerability requires a malicious actor to create and distribute a Helm plugin with a specially crafted name. The risk is primarily relevant when installing untrusted Helm plugins. No evidence of active exploitation in the wild has been reported (GitHub Advisory).

The issue has been patched in Helm versions 2.16.11 and 3.3.2. For users unable to upgrade immediately, the recommended workaround is to avoid installing untrusted Helm plugins and to examine the name field in the plugin.yaml file for any characters outside of the [a-zA-Z0-9._-] range (GitHub Advisory).