It's already patched. These things happen. While I'm a huge believe that Docker-like containerization has little proper use in production (see conversation on NodeBB's forums), this isn't a Docker problem. It's just a mistake that can happen when using containerization. Yes, Docker is more risky by being the brand new, shiny product rather than one with decades of testing and auditing. But it's minor as it was identified and patched very quickly.