GHSA-339V-266X-79XR nebula-mesh: Host revocation is not durable - blocked/offboarded hosts can regain a valid certificate

Summary Two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate issuance time — only at poll time. 1. Blocklist not enforced at sign / re-enroll time...