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CVE-2021-43801

Estado: ModificadaAlta (7.5)—

Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.

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)

Mercurius Project — Mercurius

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-43801",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "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-advisories@github.com",
      "affectedData": [
        {
          "vendor": "mercurius-js",
          "product": "mercurius",
          "versions": [
            {
              "status": "affected",
              "version": ">= 8.10.0, < 8.11.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-12-13T20:15:07.577",
  "references": [
    {
      "url": "https://github.com/mercurius-js/mercurius/issues/677",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
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      "url": "https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223",
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        "Third Party Advisory"
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      "source": "security-advisories@github.com"
    },
    {
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      "tags": [
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        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223",
      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://github.com/mercurius-js/mercurius/security/advisories/GHSA-273r-rm8g-7f3x",
      "tags": [
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        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-754"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler."
    },
    {
      "lang": "es",
      "value": "Mercurius es un adaptador GraphQL para Fastify. Cualquier usuario de Mercurius@ versiones 8.10.0 a 8.11.1, está sujeto a un ataque de denegación de servicio mediante el envío de un JSON malformado a \"/graphql\" a menos que esté usando un administrador de errores personalizado. La vulnerabilidad ha sido corregida en https://github.com/mercurius-js/mercurius/pull/678 y ha sido distribuida en la versión 8.11.2. Como solución, los usuarios pueden usar un administrador de errores personalizado"
    }
  ],
  "lastModified": "2026-06-17T04:11:27.953",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8746C91F-FFCB-4ECD-BE62-EDFF7D9AACC6",
              "versionEndExcluding": "8.11.2",
              "versionStartIncluding": "8.10.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}