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CVE-2026-66066

Estado: Pendiente de análisisCrítica (9.5)—

Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CVE en aplicación web (AV:N/AC:L/PR:N), ataque sin autenticación a través de carga de imagen. Lectura de ficheros y secretos via operación libvips insegura; exposición de credenciales habilita RCE/movimiento lateral.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User TrainingPrivileged Account ManagementPassword PoliciesActive Directory ConfigurationVulnerability ScanningUser Account Management

Tecnologías afectadas (3)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Libvips — LibvipsAIRails — Action PackAIRubyonrails — Active StorageAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-66066",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-66066",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-04T03:56:19.910457Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.5,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "rails",
          "product": "rails",
          "versions": [
            {
              "status": "affected",
              "version": "< 7.2.3.2"
            },
            {
              "status": "affected",
              "version": ">= 8.0.0.beta1, < 8.0.5.1"
            },
            {
              "status": "affected",
              "version": ">= 8.1.0.beta1, < 8.1.3.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-30T19:18:35.843",
  "references": [
    {
      "url": "https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/releases/tag/v7.2.3.2",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/releases/tag/v8.0.5.1",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/releases/tag/v8.1.3.1",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html",
      "source": "security-advisories@github.com"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/29/9",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/01/6",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/rails/rails-forensics-CVE-2026-66066",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1."
    }
  ],
  "lastModified": "2026-09-10T20:36:14.340",
  "sourceIdentifier": "security-advisories@github.com"
}