CyberRota Analysis
AI-GeneratedThe `@ai-sdk/harness-opencode` tool prior to version 1.0.28 is vulnerable on Linux systems, allowing untrusted code in the sandbox to invoke arbitrary host-exposed tools, potentially leading to unauthorized access to sensitive operations such as secret lookups and cloud API calls. Organizations using this tool should prioritize updating to version 1.0.28 to mitigate the risk of exploitation, especially if they operate in environments with untrusted dependencies or code. It is also advisable to limit the use of sensitive host-exposed tools when working with untrusted repositories.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
The `@ai-sdk/harness-opencode` tool connects HarnessAgent to OpenCode through a sandboxed bridge. Prior to version 1.0.28, the tool relay authorizes requests from any process whose command line contains an allowed helper script path (`host-tool-mcp.mjs`). This allows untrusted code executing in the sandbox to invoke arbitrary host-exposed tools including secret lookups, deployment operations, and cloud API calls without a corresponding model-authorized tool-call event. Exploitation requires a Linux environment (the vulnerable fallback checks `process.platform === 'linux'` and reads `/proc`); an active harness session with one or more host-provided tools; and untrusted code executing in the sandbox (e.g. a malicious dependency, build script, or lifecycle hook) The fix in version 1.0.28 removes the process-path authorization fallback entirely. Relay requests are now only accepted after exact, short-lived, one-time authorization matching the tool name and input from a bridge-observed model event. Some workarounds are available. Do not run the OpenCode harness on untrusted repositories or with untrusted dependencies, and/or limit host-exposed tools to non-sensitive operations when working with untrusted code.