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CVE-2024-3651

Estado: ModificadaAlta (7.5)—💥 PoC

A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the `idna.encode()` function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (1)

KJD — Internationalized Domain Names IN Applications

CWE

Referencias

JSON original (NVD)

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  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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          "version": "2.0.3",
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          "integrityImpact": "NONE",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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          "confidentialityImpact": "NONE"
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      "affectedData": [
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          "vendor": "kjd",
          "product": "kjd/idna",
          "versions": [
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              "version": "unspecified",
              "lessThan": "3.7",
              "versionType": "custom"
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  "published": "2024-07-07T18:15:09.827",
  "references": [
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      "url": "https://github.com/kjd/idna/commit/1d365e17e10d72d0b7876316fc7b9ca0eebdd38d",
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  "vulnStatus": "Modified",
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      "type": "Secondary",
      "source": "security@huntr.dev",
      "description": [
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          "value": "CWE-1333"
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  "descriptions": [
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      "value": "A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the `idna.encode()` function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size."
    },
    {
      "lang": "es",
      "value": "Se identificó una vulnerabilidad en la librería kjd/idna, específicamente dentro de la función `idna.encode()`, afectando a la versión 3.6. El problema surge del manejo por parte de la función de cadenas de entrada manipuladas, lo que puede generar complejidad cuadrática y, en consecuencia, una condición de denegación de servicio. Esta vulnerabilidad se activa por una entrada manipulada que hace que la función `idna.encode()` procese la entrada con una carga computacional considerable, aumentando significativamente el tiempo de procesamiento de manera cuadrática en relación con el tamaño de la entrada."
    }
  ],
  "lastModified": "2026-06-17T07:44:44.377",
  "configurations": [
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      "nodes": [
        {
          "negate": false,
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}