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Path Traversal occurrences in Helm
In Helm greater than or equal to 3.0.0 and less than 3.2.4, a path traversal attack is possible when installing Helm plugins from a tar archive over HTTP. It is possible for a malicious plugin author to inject a relative path into a plugin archive, and copy a file outside of the intended directory. This has been fixed in 3.2.4. (2020-06-16, CVE-2020-4053)
All versions of Helm between Helm >=2.0.0 and < 2.12.2 contains a CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in The commands `helm fetch --untar` and `helm lint some.tgz` that can result when chart archive files are unpacked a file may be unpacked outside of the target directory. This attack appears to be exploitable via a victim must run a helm command on a specially crafted chart archive. This vulnerability appears to have been fixed in 2.12.2. (2019-02-04, CVE-2019-1000008)
Why Path Traversal can be dangerous
Relative Path Confusion means that your web server is configured to serve responses to ambiguous URLs. This configuration can possibly cause confusion about the correct relative path for the URL. It is also an issue of resources, such as images, styles etc., which are specified in the response using relative path, not the absolute URL.
If the web browser permits to parse "cross-content" response, the attacker may be able to fool the web browser into interpreting HTML into other content types, which can then lead to a cross site scripting attack (link do XSS).