OpenCode Security: The RCE That Should Change How You Run Every Agent

The top Reddit result for "OpenCode security" is a post titled "arbitrary code execution — major vulnerability." Hacker News at #3 has "unauthenticated RCE." The community is not asking whether OpenCode is secure. They are asking how to contain the damage when the next agent vulnerability is discovered — and the answer is not "wait for a patch."

The RCE Was Terrifying. The Containment Should Have Been Routine.

A remote code execution vulnerability in a coding agent means an attacker can run arbitrary commands on the machine where the agent operates. In a standard development environment, that machine has access to your source code, your configuration files, your package registries, and — depending on your setup — your production infrastructure.

The patch fixed the vulnerability. It did not fix the architecture that gave the vulnerability access to everything. The next RCE — in OpenCode, in any coding agent, in any MCP tool the agent loads — will inherit the same access. Because the agent runs where your developer runs, with the permissions your developer has.

How to Run Agents Where a Breach Cannot Escape

The containment is not a better sandbox. It is a different execution model entirely — one where the agent runs inside a physical isolation boundary that it cannot escape, regardless of what vulnerabilities it contains:

The agent's workspace is the boundary: It can only access files within its assigned scope. No production configs. No credential files. No customer data. The operating system enforces this — not the agent's configuration.

The network is denied by default: The agent can only communicate through channels you explicitly authorize. An RCE that tries to exfiltrate data hits a network boundary it cannot cross.

The evidence survives the exploit: Even if the agent is compromised, the governance layer captures what happened — because the evidence chain lives outside the agent's control.

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