TC-2025-0015 · NPM · MCP

@modelcontextprotocol/[email protected]

CVE-2025-49596 (CVSS 9.4): unauthenticated localhost proxy in Official MCP Inspector allows DNS rebinding / CSRF from any web page to spawn arbitrary STDIO processes.

Primary advisory (Oligo Security) Back to all 66 records

Signed ledger verdict

TC-2025-0015
Known bad (exit 2) npm:@modelcontextprotocol/[email protected]

IOC & scope: npm:@modelcontextprotocol/[email protected] (CVE-2025-49596). Verified by human review and signed into the CC-BY 4.0 OSV v1.6.0 feed.

Credited finder
Oligo Security ↗
Recorded timestamp
2025-06-30
Canonical SHA-256
d072036f36b75cd1…
Local hook action
Block (exit 2)
Run live in Counter Workbench

Signed in /feed.json (.sig).

01 8-Vector Capability X-Ray (ABOM) & OWASP Agentic Crosswalk

Deterministic capability profile and taxonomy mapping.

Every artifact in the threat.cafe ledger is profiled across eight execution vectors and mapped to the OWASP Top 10 for Agentic Applications (ASI01-ASI10) and Agentic Skills & Tools (AST01-AST10).

8-Vector Capability X-Ray (ABOM)

  1. 1. Filesystem
    Sensitive paths touched: None observed
  2. 2. Environment
    Variables harvested: None observed
  3. 3. Network
    Outbound egress domains: 127.0.0.1:6277 (/sse, /message without session token prior to 0.14.1)
  4. 4. Subprocess
    Process execution primitives: spawn(req.query.command, req.query.args)
  5. 5. Lifecycle
    Install / startup hooks: None observed
  6. 6. OAuth / MCP
    Declared scopes: None observed
  7. 7. Obfuscation
    Encoding / steganography: None observed
  8. 8. Provenance
    Attestation status: vulnerable_release_cve_2025_49596

Governance & detector mapping

  1. OWASP Agentic ASI (2026): ASI02 (Tool Misuse & Exploitation), ASI05 (Unexpected Code Execution (RCE))
  2. OWASP Agentic AST (2026): AST02 (Tool & Skill Injection), AST03 (Insecure Credential Handling)
  3. Deterministic rules matched: CONFIG_02_LOCALHOST_NO_AUTH

Version scoping & related records

Local CLI verification

$ threat-cafe-hook check "npm:@modelcontextprotocol/[email protected]"
[threat.cafe] known_bad: npm:@modelcontextprotocol/[email protected] (TC-2025-0015)
  Reason: CVE-2025-49596 (CVSS 9.4): unauthenticated localhost proxy in Official MCP Inspector allow
  Source: https://nvd.nist.gov/vuln/detail/CVE-2025-49596 (credited to Oligo Security)

OSV v1.6.0 machine-readable record

Included in /feed.json under CC-BY 4.0 license and verified by /feed.json.sig.

{
  "schema_version": "1.6.0",
  "id": "TC-2025-0015",
  "modified": "2025-06-30T11:00:00Z",
  "published": "2025-06-30T11:00:00Z",
  "summary": "CVE-2025-49596 (CVSS 9.4): unauthenticated localhost proxy in Official MCP Inspector allows DNS rebinding / CSRF from any web page to spawn arbitrary STDIO processes.",
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@modelcontextprotocol/inspector"
      },
      "versions": [
        "0.14.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "Oligo Security",
      "type": "FINDER"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49596"
    },
    {
      "type": "WEB",
      "url": "https://threat.cafe/incidents/tc-2025-0015/"
    }
  ],
  "database_specific": {
    "target": "npm:@modelcontextprotocol/[email protected]",
    "kind": "mcp",
    "verdict": "known_bad",
    "ioc": "npm:@modelcontextprotocol/[email protected] (CVE-2025-49596)",
    "artifact_sha256": "d072036f36b75cd1f2cee891ef48e0733e8e40846e08e5833bd438aca40c0c6e",
    "owasp_asi": [
      "ASI02",
      "ASI05"
    ],
    "owasp_ast": [
      "AST02",
      "AST03"
    ],
    "rules_matched": [
      "CONFIG_02_LOCALHOST_NO_AUTH"
    ],
    "abom": {
      "fs_sensitive": [],
      "env_harvest": [],
      "net_egress": [
        "127.0.0.1:6277 (/sse, /message without session token prior to 0.14.1)"
      ],
      "proc_exec": [
        "spawn(req.query.command, req.query.args)"
      ],
      "install_hooks": [],
      "oauth_scopes": [],
      "obfuscation": [],
      "provenance": "vulnerable_release_cve_2025_49596"
    },
    "license": "CC-BY-4.0",
    "record_digest": "sha256:a8706a1fab098fa878c7aceefdf925ef259027076b92dea98031532bf9ebe2d6",
    "release_signature_url": "https://threat.cafe/feed.json.sig"
  }
}

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