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CVE-2025-47908

Estado: AplazadaAlta (7.5)—

Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

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.

Vulnerabilidad de red sin autenticación (AV:N/PR:N) que causa asignaciones masivas de memoria mediante cabeceras ACRH malformadas, resultando en DoS por agotamiento de recursos (A:H).

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-47908",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-47908",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-08-07T13:46:29.844868Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "github.com/rs/cors",
          "product": "github.com/rs/cors",
          "versions": [
            {
              "status": "affected",
              "version": "1.9.0",
              "lessThan": "1.11.0",
              "versionType": "semver"
            }
          ],
          "packageName": "github.com/rs/cors",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "Cors.handlePreflight"
            },
            {
              "name": "Cors.areHeadersAllowed"
            },
            {
              "name": "New"
            },
            {
              "name": "splitHeaderValues"
            },
            {
              "name": "AllowAll"
            },
            {
              "name": "Cors.HandlerFunc"
            },
            {
              "name": "Cors.ServeHTTP"
            },
            {
              "name": "Default"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-08-06T21:15:29.313",
  "references": [
    {
      "url": "https://github.com/rs/cors/issues/170",
      "source": "security@golang.org"
    },
    {
      "url": "https://github.com/rs/cors/pull/171",
      "source": "security@golang.org"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2024-2883",
      "source": "security@golang.org"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service."
    },
    {
      "lang": "es",
      "value": "El middleware genera una cantidad prohibitiva de asignaciones de montón al procesar solicitudes preflight maliciosas que incluyen un encabezado ACRH (Access-Control-Request-Headers) cuyo valor contiene muchas comas. Los atacantes pueden abusar de este comportamiento para generar una carga excesiva en el middleware/servidor con el fin de provocar una denegación de servicio."
    }
  ],
  "lastModified": "2026-06-17T09:28:49.670",
  "sourceIdentifier": "security@golang.org"
}