CVE-2026-82533: @deepseek ai/dsh client connection Authentication Bypass Vulnerability

CRITICAL
Advisory Identifier: GHSA-8m2g-8cgm-3vcp
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CVSS 9.6
CWE-807
Published
Advisory Summary

CVE-2026-82533 is a CRITICAL (CVSS 9.6) authentication bypass vulnerability (CWE-807: Reliance on Untrusted Inputs in a Security Decision) affecting @deepseek ai/dsh client connection libraries in the npm ecosystem. The issue involves deepseek harness contains an authentication bypass vulnerability in local http control-plane api. Remediation is available by upgrading affected packages to version 0.1.2-alpha.1.

CVE-2026-82533 at a Glance

CVE Identifier CVE-2026-82533
GHSA Identifier GHSA-8m2g-8cgm-3vcp
Severity CRITICAL
CVSS v3.1 Base Score 9.6
CWE Classification CWE-807: Reliance on Untrusted Inputs in a Security Decision
Affected Product @deepseek ai/dsh client connection
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.6

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-82533

To remediate this vulnerability, upgrade all affected @deepseek ai/dsh client connection dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@deepseek-ai/dsh-client-connection fixed: 0.1.2-alpha.1 
npm install @deepseek-ai/dsh-client-connection@0.1.2-alpha.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @deepseek-ai/dsh-client-connection

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-82533, inspect your project dependencies using npm:

npm ls @deepseek-ai/dsh-client-connection

Analyze the terminal output to locate any version of @deepseek ai/dsh client connection in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.2-alpha.1), your application is affected.

Note: The npm ls @deepseek-ai/dsh-client-connection command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-807: Reliance on Untrusted Inputs in a Security Decision, where the product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism. In @deepseek ai/dsh client connection, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-82533 Affected @deepseek ai/dsh client connection Versions

1 component(s)
Fixed Versions:
0.1.2-alpha.1
Product / Package Ecosystem Affected Versions Fixed Version
@deepseek-ai/dsh-client-connection
npm/@deepseek-ai/dsh-client-connection
npm
< 0.1.2-alpha.1
0.1.2-alpha.1

References

NVD — CVE-2026-82533 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82533
Security Fix Commit FIX COMMIT
https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27
@deepseek ai/dsh client connection Source Repository REPOSITORY
https://github.com/deepseek-ai/deepseek-harness
@deepseek ai/dsh client connection Release RELEASE
https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1
@deepseek ai/dsh client connection Security Information SECURITY
https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape
www.vulncheck.com/advisories/deepseek... WEB
https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing

Frequently Asked Questions

What is CVE-2026-82533?
CVE-2026-82533 is a security vulnerability in @deepseek ai/dsh client connection involving DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API under CWE-807: Reliance on Untrusted Inputs in a Security Decision.
Which @deepseek ai/dsh client connection versions are affected?
Affected versions include releases prior to 0.1.2-alpha.1 across affected packages: @deepseek-ai/dsh-client-connection.
What version fixes CVE-2026-82533?
Upgrading to 0.1.2-alpha.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @deepseek-ai/dsh-client-connection affected?
Yes, @deepseek-ai/dsh-client-connection is affected in releases prior to 0.1.2-alpha.1. Upgrade your dependency to 0.1.2-alpha.1 or later.
What is the CVSS score of CVE-2026-82533?
CVE-2026-82533 has a CVSS v3.1 base score of 9.6 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-82533?
CVE-2026-82533 is classified under CWE-807: Reliance on Untrusted Inputs in a Security Decision (The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.).
How can I check npm dependencies for CVE-2026-82533?
Run the dependency tree command: 'npm ls @deepseek-ai/dsh-client-connection'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8m2g-8cgm-3vcp",
  "modified" : "2026-10-07T20:41:36Z",
  "published" : "2026-09-08T18:32:01Z",
  "aliases" : [ "CVE-2026-82533" ],
  "summary" : "DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@deepseek-ai/dsh-client-connection"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.2-alpha.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-82533"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/deepseek-ai/deepseek-harness"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1"
  }, {
    "type" : "WEB",
    "url" : "https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-807" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-07T20:41:36Z",
    "nvd_published_at" : "2026-09-08T17:18:36Z"
  }
}