Disclosure summary
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.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-8m2g-8cgm-3vcp
Open original source · Updated Oct 07, 2026
DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API
Source severity: CRITICAL / 9.4
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @deepseek-ai/dsh-client-connection | < 0.1.2-alpha.1 | 0.1.2-alpha.1 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-09-08T14:32:01-04:00
MODIFIED 2026-10-07T16:41:37-04:00
INGESTED 2026-10-08T12:30:39-04:00