GO-2026-6322 arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset in github.com/basekick-labs/arc

arc has unauthenticated cluster node admission when cluster.sharedsecret is unset in github.com/basekick-labs/arc...

EUVD-2026-67945

Arc is an open, SQL-native time-series database for telemetry. From 26.02.1 until 26.06.2, Arc Enterprise clustering accepts cluster join requests without authentication when cluster.enabled is true but cluster.sharedsecret is not configured. The defaults in internal/config/config.go set...