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CVE-2026-27734

Estado: AnalizadaMedia (6.5)—

Beszel is a server monitoring platform. Prior to version 0.18.2, the hub's authenticated API endpoints GET /api/beszel/containers/logs and GET /api/beszel/containers/info pass the user-supplied "container" query parameter to the agent without validation. The agent constructs Docker Engine API URLs using fmt.Sprintf with the raw value instead of url.PathEscape(). Since Go's http.Client does not sanitize `../` sequences from URL paths sent over unix sockets, an authenticated user (including readonly role) can traverse to arbitrary Docker API endpoints on agent hosts, exposing sensitive infrastructure details. Version 0.18.4 fixes the issue.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Beszel — Beszel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-27734",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27734",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-02T12:51:38.292112Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "henrygd",
          "product": "beszel",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.18.4"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-27T20:21:38.950",
  "references": [
    {
      "url": "https://github.com/henrygd/beszel/releases/tag/v0.18.4",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/henrygd/beszel/security/advisories/GHSA-phwh-4f42-gwf3",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Beszel is a server monitoring platform. Prior to version 0.18.2, the hub's authenticated API endpoints GET /api/beszel/containers/logs and GET /api/beszel/containers/info pass the user-supplied \"container\" query parameter to the agent without validation. The agent constructs Docker Engine API URLs using fmt.Sprintf with the raw value instead of url.PathEscape(). Since Go's http.Client does not sanitize `../` sequences from URL paths sent over unix sockets, an authenticated user (including readonly role) can traverse to arbitrary Docker API endpoints on agent hosts, exposing sensitive infrastructure details. Version 0.18.4 fixes the issue."
    },
    {
      "lang": "es",
      "value": "Beszel es una plataforma de monitorización de servidores. Antes de la versión 0.18.2, los endpoints autenticados de la API del hub GET /api/beszel/containers/logs y GET /api/beszel/containers/info pasaban el parámetro de consulta 'container' proporcionado por el usuario al agente sin validación. El agente construye URLs de la API de Docker Engine usando fmt.Sprintf con el valor sin procesar en lugar de url.PathEscape(). Dado que el http.Client de Go no sanitiza las secuencias '../' de las rutas URL enviadas a través de sockets Unix, un usuario autenticado (incluido el rol de solo lectura) puede acceder a endpoints arbitrarios de la API de Docker en los hosts del agente, exponiendo detalles sensibles de la infraestructura. La versión 0.18.4 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:27:34.413",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:beszel:beszel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E3248EB7-FB3C-4F5E-9EA7-8F74CF7B541F",
              "versionEndExcluding": "0.18.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}