# CVE-2026-82533

## Summary

- **CVE ID:** CVE-2026-82533
- **Severity:** CRITICAL
- **CVSS Score:** 9.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H)
- **CWE:** CWE-807
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 10, 2026

## 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.

## Affected Products

- DeepSeek — DeepSeek Harness (0)

## References

- [CNA](https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1)
- [CNA](https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27)
- [CNA](https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing)
- [CNA](https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 35.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._