{
  "cveId": "CVE-2025-14009",
  "url": "https://patchblox.com/security/cve/CVE-2025-14009",
  "summary": "CVE-2025-14009 is fixed in 3 products on 1 platform, first by python-nltk 3.2.5-1ubuntu0.1\u002Besm3, released February 18, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "python3-nltk: A critical vulnerability exists in the NLTK downloader component of nltk/nltk, affecting all versions",
  "description": "A critical vulnerability exists in the NLTK downloader component of nltk/nltk, affecting all versions. The _unzip_iter function in nltk/downloader.py uses zipfile.extractall() without performing path validation or security checks. This allows attackers to craft malicious zip packages that, when downloaded and extracted by NLTK, can execute arbitrary code. The vulnerability arises because NLTK assumes all downloaded packages are trusted and extracts them without validation. If a malicious package contains Python files, such as __init__.py, these files are executed automatically upon import, leading to remote code execution. This issue can result in full system compromise, including file system access, network access, and potential persistence mechanisms.",
  "published": "2026-02-18T10:24:00Z",
  "severity": "High",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.01036,
  "epssPercentile": 0.64108,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "nltk",
      "release": "Debian 14",
      "fixedVersion": "3.9.3-1",
      "fix": "DEBIAN-CVE-2025-14009",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-14009",
      "released": "2026-02-18T18:24:19Z"
    },
    {
      "platform": "linux",
      "product": "python-nltk",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "3.2.5-1ubuntu0.1\u002Besm3",
      "fix": "python-nltk 3.2.5-1ubuntu0.1\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-nltk-3.2.5-1ubuntu0.1-esm3",
      "released": "2026-02-18T10:24:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-nltk",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "3.2.5-1ubuntu0.1\u002Besm3",
      "fix": "python3-nltk 3.2.5-1ubuntu0.1\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-nltk-3.2.5-1ubuntu0.1-esm3",
      "released": "2026-02-18T10:24:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-nltk",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.4.5-2ubuntu0.1~esm3",
      "fix": "python3-nltk 3.4.5-2ubuntu0.1~esm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-nltk-3.4.5-2ubuntu0.1-esm3",
      "released": "2026-02-18T10:24:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-nltk",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.7-1ubuntu0.1~esm1",
      "fix": "python3-nltk 3.7-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-nltk-3.7-1ubuntu0.1-esm1",
      "released": "2026-02-18T10:24:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-nltk",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.8.1-1ubuntu0.1~esm1",
      "fix": "python3-nltk 3.8.1-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-nltk-3.8.1-1ubuntu0.1-esm1",
      "released": "2026-02-18T10:24:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-nltk",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.9.2-1ubuntu0.1~esm1",
      "fix": "python3-nltk 3.9.2-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-nltk-3.9.2-1ubuntu0.1-esm1",
      "released": "2026-02-18T10:24:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}