Security advisory

{
  "id": "3aec8ee0e6358414dbe21e7c120293c37f2a1f296a1aec064a6d81bdc8d5213c",
  "url": "https://osv.dev/vulnerability/CVE-2019-14751",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-14751",
    "summary": "NLTK Downloader before 3.4.5 is vulnerable to a directory traversal, allowing attackers to write arbitrary files via a ../ (dot dot slash) in an NLTK package (ZIP archive) that is mishandled during extraction.",
    "evidence": "osv:CVE-2019-14751",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-14751",
      "aliases": [
        "CVE-2019-14751",
        "GHSA-mr7p-25v2-35wr",
        "PYSEC-2019-106"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nltk/nltk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "acca8d573878e173379fe190d7f14f298b12dac9"
                },
                {
                  "fixed": "f59d7ed8df2e0e957f7f247fe218032abdbe9a10"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.4.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f59d7ed8df2e0e957f7f247fe218032abdbe9a10"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.4.4",
            "3.4.3",
            "3.4.1",
            "3.4",
            "3.3",
            "3.2.5",
            "3.2.4",
            "3.2.3",
            "3.2.2",
            "3.2.1",
            "3.2",
            "3.1",
            "3.0.5",
            "3.0.4",
            "3.0.3",
            "3.0.2",
            "3.0.0b1",
            "3.0a4",
            "2.0.1rc4",
            "2.0.1rc3",
            "2.0.1rc2",
            "2.0.1rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-14751.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:42.793657484Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/",
        "https://github.com/nltk/nltk/blob/3.4.5/ChangeLog",
        "https://github.com/mssalvatore/CVE-2019-14751_PoC",
        "https://github.com/nltk/nltk/commit/f59d7ed8df2e0e957f7f247fe218032abdbe9a10",
        "https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-14751",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383758,
  "published_at": "2019-08-22T16:15:10.213+00:00"
}