CVE-2026-82533: DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API
(updated )
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.
References
- github.com/advisories/GHSA-8m2g-8cgm-3vcp
- github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27
- github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1
- nvd.nist.gov/vuln/detail/CVE-2026-82533
- www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape
- www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing
Code Behaviors & Features
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