arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset

Summary Arc Enterprise clustering accepts cluster join requests without authentication when cluster.enabled=true but cluster.sharedsecret is not configured. The coordinator validates HMAC authentication only if a shared secret is non-empty; otherwise, a network attacker who can reach the...

GHSA-P378-JP5R-GPGW arc has unauthenticated cluster node admission when `cluster.shared_secret` is unset

Summary Arc Enterprise clustering accepts cluster join requests without authentication when cluster.enabled=true but cluster.sharedsecret is not configured. The coordinator validates HMAC authentication only if a shared secret is non-empty; otherwise, a network attacker who can reach the...

CVE-2026-55678

Arc is an open, SQL-native time-series database for telemetry. In Enterprise cluster deployments from v26.02.1 to v26.06.2 , the coordinator accepts cluster join requests without authentication when cluster.enabled=true but cluster.shared_secret is empty. The HMAC validation in coordinator.go is ...