Bug 2567758 (CVE-2026-82033)

Summary: CVE-2026-82033 deepseek-harness: deepseek-harness: Arbitrary command execution via unauthenticated RPC control plane
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in DeepSeek Harness. A missing authentication check in its Remote Procedure Call (RPC) control plane allows an unauthorized local attacker to access internal session interfaces. By interacting with these unauthenticated endpoints, an attacker can bypass human approval safeguards, monitor active session traffic, and execute arbitrary commands with the privileges of the victim user.
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Description OSIDB Bzimport 2026-11-05 22:23:51 UTC 
DeepSeek Harness prior to 0.1.2-alpha.2, and specifically commit 3e24087, contains a missing authentication vulnerability in its web profile HTTP and WebSocket RPC control plane, allowing any local process, including those running as a different OS user, to reach unauthenticated session methods such as session.create and session.prompt. Attackers can invoke session.prompt to trigger the agent's bash and filesystem tools, achieve arbitrary command execution as the victim user using their configured model credentials, intercept live session traffic and logs over the event mux stream, and bypass human tool-approval checks via POST /api/respond by matching only rpcId, approvalId, and sessionId values broadcast over the ungated stream.