A flaw was found in Helm, a tool for managing Charts, a pre-configured Kubernetes resources. Versions prior to 3.10.3 are subject to NULL Pointer Dereference in thechartutil package that could cause a segmentation violation. The chartutil package contains a parser that loads a JSON Schema validation files into structures Go can work with. Some schema files can cause array data structures to be created, causing a memory violation. Applications that use the chartutil package in the Helm SDK to parse a schema files may result in a denial of service.

A flaw was found in the helm package. The 'getHostByName' is a Helm template function introduced in Helm v3 and can accept a hostname and return an IP address for that hostname. To get the IP address, the function performs a DNS lookup. The DNS lookup happens when used with 'helm install|upgrade|template' or when the Helm SDK is used to render a chart. Information passed into the chart can be disclosed to the DNS servers used to look up the IP address. For example, a malicious chart could inject getHostByName into a chart to disclose values to a malicious DNS server.