> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# kona-host Releases

> Release history for kona-host. Rust fault proof host binary.

**kona-host** runs natively alongside the prover, serving as the [Preimage Oracle](https://specs.optimism.io/experimental/fault-proof/index.html) server that supplies chain data to kona-client during proof execution.

<Update label="May 25, 2026" description="v1.5.2" tags={["Latest", "Stable"]}>
  ## Overview

  This is a patch release of kona-host that adds defense-in-depth verification of preimage bytes against the requested key. It is an optional upgrade.

  [View full release on GitHub →](https://github.com/ethereum-optimism/optimism/releases/tag/kona-host/v1.5.2)
</Update>

<Update label="May 12, 2026" description="v1.5.1" tags={["Stable"]}>
  ## Overview

  > \[!CAUTION]
  > ⚠️ This release is a critical security fix and is a required update for users `kona-host`.

  This is a minor release of `kona-host` that includes important bug fixes for state trie handling of destroyed accounts.

  [View full release on GitHub →](https://github.com/ethereum-optimism/optimism/releases/tag/kona-host/v1.5.1)
</Update>