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

{
  "id": "b9769b1a914820517c3267bd5e7004b3c8a15b6659066cc0a99971401c0f72ca",
  "url": "https://osv.dev/vulnerability/GHSA-8m2g-8cgm-3vcp",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DeepSeek Harness contains an authentication bypass vulnerability in local HTTP control-plane API",
    "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.",
    "evidence": "osv:GHSA-8m2g-8cgm-3vcp",
    "products": [
      {
        "name": {
          "value": "@deepseek-ai/dsh-client-connection",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.2-alpha.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "GHSA-8m2g-8cgm-3vcp",
      "aliases": [
        "CVE-2026-82533",
        "GHSA-8m2g-8cgm-3vcp"
      ],
      "metrics": [
        {
          "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": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.1.2-alpha.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@deepseek-ai/dsh-client-connection",
            "purl": "pkg:npm/%40deepseek-ai/dsh-client-connection",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-8m2g-8cgm-3vcp/GHSA-8m2g-8cgm-3vcp.json"
          }
        }
      ],
      "modified": "2026-10-07T21:00:04.349245572Z",
      "provider": "osv",
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82533",
        "https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b936895b8f93fe27",
        "https://github.com/deepseek-ai/deepseek-harness",
        "https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1",
        "https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-escape",
        "https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-bypass-via-host-header-spoofing"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-807"
        ],
        "severity": "CRITICAL",
        "github_reviewed": true,
        "nvd_published_at": "2026-09-08T17:18:36Z",
        "github_reviewed_at": "2026-10-07T20:41:36Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82533",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97277,
  "published_at": "2026-09-08T18:32:01+00:00"
}