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CVE-2026-82533— DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing

Quick assessment

Affected
DeepSeek DeepSeek Harness
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DeepSeek Harness是中国DeepSeek公司的一款信息化产品。 DeepSeek Harness 0.1.2-alpha.1之前版本存在输入验证错误漏洞，该漏洞源于其本地HTTP控制面API仅验证客户端提供的Host标头值而非实际TCP连接来源，导致身份验证绕过，攻击者可通过提供伪造的Host标头获取完全代理控制权，调用具有危险全访问权限的特权命令（如commands/execute）、将会话审批策略升级为无限制执行，并可无凭据检索所有存储的对话。

CVSS 9.6 · Critical EPSS 0.62% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
DeepSeek DeepSeek Harness < 0.1.2-alpha.1 affected
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I. Basic Information for CVE-2026-82533

Vulnerability Information
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Vulnerability Title
DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability that grants unauthenticated access to its local HTTP agent-control API by accepting a client-supplied loopback Host header in place of validating the actual TCP connection origin. On the default configuration, a confined tool-executed process can reach the loopback API without any port exposure and use it to escape its own OS sandbox, escalate to unconfined execution, and disable the approval prompt. When the port is externally reachable via tunnel, SSH forward, or reverse proxy, a remote attacker can exploit the same flaw to create sessions, execute arbitrary commands, and exfiltrate stored conversation transcripts without credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
Source: CVE Program / CVE List V5
Vulnerability Title
DeepSeek Harness 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DeepSeek Harness是中国DeepSeek公司的一款信息化产品。 DeepSeek Harness 0.1.2-alpha.1之前版本存在输入验证错误漏洞，该漏洞源于其本地HTTP控制面API仅验证客户端提供的Host标头值而非实际TCP连接来源，导致身份验证绕过，攻击者可通过提供伪造的Host标头获取完全代理控制权，调用具有危险全访问权限的特权命令（如commands/execute）、将会话审批策略升级为无限制执行，并可无凭据检索所有存储的对话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DeepSeek DeepSeek Harness 0 ~ 0.1.2-alpha.1 -

II. Public POCs for CVE-2026-82533

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III. Intelligence Information for CVE-2026-82533

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Patches & Fixes for CVE-2026-82533 (1)

Vendor Advisories for CVE-2026-82533 (1)

Security Blog Posts for CVE-2026-82533 (1)

IV. Related Vulnerabilities

Same weakness: CWE-807

V. Comments for CVE-2026-82533

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