Helm 4 integrates the Extism WebAssembly plugin to provide sandboxed security for Kubernetes deployments. Unlike Helm 3, which ran plugins without isolation, Helm 4 creates an invisible sandbox that restricts plugin access to the host system, blocking unauthorized file or network access. The author clarifies a common misconception: WebAssembly is not a replacement for Kubernetes but rather an extender of existing systems. The Extism plugin improves supply chain and runtime security through mandatory signing, verification, and clearer provenance, while keeping Helm's default behavior intact.
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