CVE-2026-49856

{
  "id": "CVE-2026-49856",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-13T15:19:41.563",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "@jshookmcp/jshook is an MCP server that gives AI agents tools for JavaScript analysis and security research. In version 0.3.1, he network domain has a central SSRF authorization policy that blocks private, loopback, link-local, and reserved targets unless an explicit authorization object allows private network access. The policy is enforced by raw HTTP/TCP/TLS RTT tools, but the ICMP probe and traceroute tools resolve the target and invoke the native ICMP/traceroute sink directly. An MCP client with access to an active network domain can therefore ask the jshookmcp server to probe internal addresses even when local SSRF access is disabled for the other raw network tools. This exposes an internal reachability and route mapping primitive from the server network position. Version 0.3.2 fixes the issue."
    },
    {
      "lang": "es",
      "value": "@jshookmcp/jshook es un servidor MCP que proporciona a los agentes de IA herramientas para el análisis de JavaScript y la investigación de seguridad. En la versión 0.3.1, el dominio de red tiene una política de autorización SSRF central que bloquea objetivos privados, de bucle invertido, de enlace local y reservados, a menos que un objeto de autorización explícito permita el acceso a la red privada. La política es aplicada por herramientas HTTP/TCP/TLS RTT sin procesar, pero las herramientas de sondeo ICMP y traceroute resuelven el objetivo e invocan directamente el sumidero nativo de ICMP/traceroute. Un cliente MCP con acceso a un dominio de red activo puede, por lo tanto, pedir al servidor jshookmcp que sondee direcciones internas incluso cuando el acceso SSRF local está deshabilitado para las otras herramientas de red sin procesar. Esto expone una primitiva de accesibilidad interna y mapeo de rutas desde la posición de red del servidor. La versión 0.3.2 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "vmoranv",
          "product": "jshookmcp",
          "versions": [
            {
              "version": "= 0.3.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-13T17:25:52.963425Z",
          "id": "CVE-2026-49856",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/vmoranv/jshookmcp/commit/02111311f7bd0f86a7d7ef8538986594b3a18afa",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/vmoranv/jshookmcp/security/advisories/GHSA-c5r6-m4mr-8q5j",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/vmoranv/jshookmcp/security/advisories/GHSA-c5r6-m4mr-8q5j",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}