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CVE-2026-40324

Estado: AplazadaCrítica (9.1)—

Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser `Utf8GraphQLParser` has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a `StackOverflowException` on payloads as small as 40 KB. Because `StackOverflowException` is uncatchable in .NET (since .NET 2.0), the entire worker process is terminated immediately.

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All in-flight HTTP requests, background `IHostedService` tasks, and open WebSocket subscriptions on that worker are dropped. The orchestrator (Kubernetes, IIS, etc.) must restart the process. This occurs before any validation rules run — `MaxExecutionDepth`, complexity analyzers, persisted query allow-lists, and custom `IDocumentValidatorRule` implementations cannot intercept the crash because `Utf8GraphQLParser.Parse` is invoked before validation. The `MaxAllowedFields=2048` limit does not help because the crashing payloads contain very few fields. The fix in versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14 adds a `MaxAllowedRecursionDepth` option to `ParserOptions` with a safe default, and enforces it across all recursive parser methods (`ParseSelectionSet`, `ParseValueLiteral`, `ParseObject`, `ParseList`, `ParseTypeReference`, etc.). When the limit is exceeded, a catchable `SyntaxException` is thrown instead of overflowing the stack. There is no application-level workaround. `StackOverflowException` cannot be caught in .NET. The only mitigation is to upgrade to a patched version. Operators can reduce (but not eliminate) risk by limiting HTTP request body size at the reverse proxy or load balancer layer, though the smallest crashing payload (40 KB) is well below most default body size limits and is highly compressible (~few hundred bytes via gzip).

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.

Parser GraphQL remoto sin límite de profundidad de recursión. Un documento crafted con ~40 KB causa StackOverflowException inmanejable que termina el proceso worker, derribando todas las solicitudes HTTP en vuelo y conexiones WebSocket (DoS). AV:N, PR:N, UI:N confirma explotabilidad remota directa.

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 (1)

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

HOT Chocolate — HOT ChocolateAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-40324",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40324",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-20T16:14:16.099717Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "ChilliCream",
          "product": "graphql-platform",
          "versions": [
            {
              "status": "affected",
              "version": "< 12.22.7"
            },
            {
              "status": "affected",
              "version": ">= 13.0.0, < 13.9.16"
            },
            {
              "status": "affected",
              "version": ">= 14.0.0, < 14.3.1"
            },
            {
              "status": "affected",
              "version": ">= 15.0.0, < 15.1.14"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-04-18T00:16:36.920",
  "references": [
    {
      "url": "https://github.com/ChilliCream/graphql-platform/commit/08c0caa42ca33c121bbed49d2db892e5bf6fb541",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/ChilliCream/graphql-platform/commit/4cbaf67d366f800fc1e484bc5c06dfcf27b45023",
      "source": "security-advisories@github.com"
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    {
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      "source": "security-advisories@github.com"
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    {
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/ChilliCream/graphql-platform/pull/9528",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/ChilliCream/graphql-platform/pull/9530",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/ChilliCream/graphql-platform/pull/9531",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/ChilliCream/graphql-platform/releases/tag/12.22.7",
      "source": "security-advisories@github.com"
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      "url": "https://github.com/ChilliCream/graphql-platform/releases/tag/13.9.16",
      "source": "security-advisories@github.com"
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      "url": "https://github.com/ChilliCream/graphql-platform/releases/tag/14.3.1",
      "source": "security-advisories@github.com"
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      "url": "https://github.com/ChilliCream/graphql-platform/releases/tag/15.1.14",
      "source": "security-advisories@github.com"
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      "url": "https://github.com/ChilliCream/graphql-platform/security/advisories/GHSA-qr3m-xw4c-jqw3",
      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-674"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser `Utf8GraphQLParser` has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a `StackOverflowException` on payloads as small as 40 KB. Because `StackOverflowException` is uncatchable in .NET (since .NET 2.0), the entire worker process is terminated immediately. All in-flight HTTP requests, background `IHostedService` tasks, and open WebSocket subscriptions on that worker are dropped. The orchestrator (Kubernetes, IIS, etc.) must restart the process. This occurs before any validation rules run — `MaxExecutionDepth`, complexity analyzers, persisted query allow-lists, and custom `IDocumentValidatorRule` implementations cannot intercept the crash because `Utf8GraphQLParser.Parse` is invoked before validation. The `MaxAllowedFields=2048` limit does not help because the crashing payloads contain very few fields. The fix in versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14 adds a `MaxAllowedRecursionDepth` option to `ParserOptions` with a safe default, and enforces it across all recursive parser methods (`ParseSelectionSet`, `ParseValueLiteral`, `ParseObject`, `ParseList`, `ParseTypeReference`, etc.). When the limit is exceeded, a catchable `SyntaxException` is thrown instead of overflowing the stack. There is no application-level workaround. `StackOverflowException` cannot be caught in .NET. The only mitigation is to upgrade to a patched version. Operators can reduce (but not eliminate) risk by limiting HTTP request body size at the reverse proxy or load balancer layer, though the smallest crashing payload (40 KB) is well below most default body size limits and is highly compressible (~few hundred bytes via gzip)."
    }
  ],
  "lastModified": "2026-06-17T10:45:07.063",
  "sourceIdentifier": "security-advisories@github.com"
}