CVE-2026-82533
CriticalCVSS 9.6Summary
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin.
Risk Assessment
Attackers can invoke privileged commands, escalate session approval policies to unconfined execution, and retrieve all stored conversations without any credential or API key, posing a severe security risk.
Recommendation
Immediately upgrade DeepSeek Harness to version 0.1.2-alpha.1 or later and implement additional authentication and connection origin verification mechanisms.
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Original NVD description (English source)
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin. Attackers can exploit this flaw to invoke privileged commands such as commands/execute with danger-full-access permissions, escalate session approval policies to unconfined execution, and retrieve all stored conversations without any credential or API key.