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CVE-2026-47077

Estado: AnalizadaAlta (8.2)—

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.

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This issue affects hackney: from 2.0.0 before 4.0.1.

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.

AV:N/PR:N permite explotación remota sin autenticación (T1190). CWE-400 + descripción explícita de exhaustión de memoria por acumulación sin límites = DoS por consumo de recursos (T1499.004).

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)

Benoitc — Hackney

CWE

Referencias

JSON original (NVD)

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          "options": [
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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      "affectedData": [
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          "vendor": "benoitc",
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          "packageName": "hackney",
          "programFiles": [
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          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
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  "published": "2026-05-25T15:16:22.837",
  "references": [
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      "url": "https://cna.erlef.org/cves/CVE-2026-47077.html",
      "tags": [
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        "Third Party Advisory"
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      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
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        "Vendor Advisory"
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        "Vendor Advisory"
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  "weaknesses": [
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      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
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          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de asignación de recursos sin límites ni limitación en benoitc hackney permite inundación. hackney_h3:await_response_loop/6 acumula el cuerpo de la respuesta HTTP/3 en memoria sin ningún límite de tamaño. La cláusula 'after Timeout' es un temporizador de inactividad por mensaje que se reinicia con cada fragmento recibido, mensaje de mantenimiento o trama de configuración - no es una fecha límite de reloj de pared. Un servidor HTTP/3 malicioso que emite un pequeño fragmento cada Timeout - 1 ms con Fin = false y nunca envía una trama final mantiene el bucle vivo indefinidamente mientras el búfer de acumulación crece linealmente sin límite, agotando eventualmente el heap del proceso BEAM y causando una condición de falta de memoria.\n\nEste problema afecta a hackney: desde 2.0.0 antes de 4.0.1."
    }
  ],
  "lastModified": "2026-07-24T10:10:00.197",
  "configurations": [
    {
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        {
          "negate": false,
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              "versionEndExcluding": "4.0.1",
              "versionStartIncluding": "2.0.0"
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}