DeepSeek Harness Sandbox Could Be Switched Off Locally
OX Research found a flaw in DeepSeek Harness that let attacker-supplied text make an AI agent call the tool’s own local web interface and switch its session into danger-full-access. DeepSeek fixed the issue in npm 0.1.2-alpha.2, and VulnCheck assigned CVE-2026-82533.
The break is not a direct sandbox escape. The agent could reach a localhost control plane that was already exposed inside the workspace, and one request changed the session setting that removed approval prompts and let later commands write outside the workspace.
For developers running local AI coding agents, the lesson is that a sandbox only helps if its control plane is sealed off from whatever the agent can read. If the agent can talk to its own admin surface, untrusted text can become a path from workspace-limited work to out-of-workspace command execution.
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Untrusted input could reconfigure DeepSeek Harness’s own execution context, not just influence its output.