GHSA-8m2g-8cgm-3vcp
DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @deepseek-ai/dsh-client-connection | < 0.1.2-alpha.1 | 0.1.2-alpha.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
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
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-82533
- https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27
- https://github.com/deepseek-ai/deepseek-harness
- https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1
- https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape
- https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing