CVE-2026-82533 — Vulnerability in...

CRITICAL

DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API

Published September 8, 2026Updated October 7, 2026Source: osv

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.

Advisory Timeline

First published September 8, 2026 (34 days ago).
Last revised October 7, 2026 — 29 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update @deepseek-ai/dsh-client-connection to 0.1.2-alpha.1 or later

npm install @deepseek-ai/dsh-client-connection@0.1.2-alpha.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
@deepseek-ai/dsh-client-connection	npm	All versions	0.1.2-alpha.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-807
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.6 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-82533?: DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.6/10).
How do I check if my project is affected by CVE-2026-82533?: CVE-2026-82533 affects @deepseek-ai/dsh-client-connection. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-82533 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.6

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-8m2g-8cgm-3vcp

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