CVE-2026-33236

Estado: ModificadaAlta (8.1)—
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Puntuación base: 8.1
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.71%
Percentil entre todas las CVEs puntuadas: 52
Fecha de la puntuación: 6/10/2026
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.
ExplotaciónT1203 Exploitation for Client Executionexecution85 %
Impacto principalT1565 Data Manipulationimpact80 %
Impacto secundarioT1005 Data from Local Systemcollection75 %
CVE en descargador NLTK remoto; UI:R (usuario descarga índice XML malicioso); impacto: creación/sobrescritura de archivos (T1565) y potencial lectura de datos (T1005). Vector CVSS confirma explotación en cliente.
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

Restrict File and Directory Permissions Remote Data Storage Network Segmentation Encrypt Sensitive Information Application Isolation and Sandboxing Exploit Protection
Tecnologías afectadas (1)

Nltk — Nltk
CWE

CWE-22
CWE-22
Referencias

JSON original (NVD)

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  "published": "2026-03-20T23:16:47.007",
  "references": [
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    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue."
    },
    {
      "lang": "es",
      "value": "NLTK (Natural Language Toolkit) es un conjunto de módulos Python de código abierto, conjuntos de datos y tutoriales que apoyan la investigación y el desarrollo en Procesamiento del Lenguaje Natural. En las versiones 3.9.3 y anteriores, el descargador de NLTK no valida los atributos 'subdir' e 'id' al procesar archivos de índice XML remotos. Los atacantes pueden controlar un servidor de índice XML remoto para proporcionar valores maliciosos que contengan secuencias de salto de ruta (como '../'), lo que puede llevar a la creación arbitraria de directorios, creación arbitraria de archivos y sobrescritura arbitraria de archivos. El commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a corrige el problema."
    }
  ],
  "lastModified": "2026-07-21T12:18:07.627",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E3C35863-7D82-4EEF-BDE8-E94C559CF4FB",
              "versionEndIncluding": "3.9.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}