GitHub Advisoryadvisory · npm
GHSA-8m2g-8cgm-3vcp DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API
CRITICAL
Official page ↗
- Aliases
- CVE-2026-82533
- Ecosystem
- npm
- Packages
- @deepseek-ai/dsh-client-connection
- Severity
- Critical
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-807
- Reviewed
- 2026-10-07
Affected packages
• npm @deepseek-ai/dsh-client-connection: < 0.1.2-alpha.1 → fixed in 0.1.2-alpha.1
Description
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.
Related
Alias · CVE (1)
- CVE-2026-82533 DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability that grants unauthenticated access to its local HTTP… vulnerability
Weakness · CWE (1)
- CWE-807 Reliance on Untrusted Inputs in a Security Decision weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-82533 advisory
- https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27 web
- https://github.com/deepseek-ai/deepseek-harness package
- https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1 web
- https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape web
- https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing web