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CVE-2026-42342

Estado: AnalizadaAlta (7.5)—

React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.

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.

Solicitudes HTTP artesanales contra endpoint expuesto (__manifest) causan consumo desproporcionado de recursos del servidor y degradación de servicio (DoS por application layer). Vector CVSS indica acceso remoto sin autenticación (AV:N/PR:N).

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

Tecnologías afectadas (2)

Shopify — React-routerShopify — Remix-run/server-runtime

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-42342",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42342",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-03T13:52:31.015400Z"
        }
      }
    ],
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          "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
      }
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            }
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  "published": "2026-06-02T20:16:36.693",
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      "description": [
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          "value": "CWE-400"
        }
      ]
    }
  ],
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      "lang": "en",
      "value": "React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5."
    },
    {
      "lang": "es",
      "value": "React Router es un router para React. En las versiones 7.0.0 a 7.14.x de react-router y las versiones 2.10.0 a 2.17.4 de @remix-run/server-runtime, ciertas solicitudes especialmente diseñadas pueden consumir recursos desproporcionados del servidor a través de una expansión de ruta ilimitada en el endpoint __manifest, lo que resulta en una degradación del tiempo de respuesta y/o indisponibilidad del servicio para los usuarios finales. Esto afecta a las aplicaciones en modo Framework de React Router, así como a las aplicaciones Remix. Esto no tiene impacto en las aplicaciones que utilizan el Modo Declarativo ('<BrowserRouter>') o el Modo de Datos ('createBrowserRouter/<RouterProvider>'). Esto se ha parcheado en la versión 7.15.0 de react-router y en la versión 2.17.5 de @remix-run/server-runtime."
    }
  ],
  "lastModified": "2026-07-21T19:10:00.107",
  "configurations": [
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}