nltk IPIPANCorpusReader Symlink Arbitrary File Read

{
  "id": "b29a25a809537a13c13b4d8c53e3166f1f15bc9e0566b97a21029b54176a34e7",
  "url": "https://osv.dev/vulnerability/CVE-2026-62383",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nltk IPIPANCorpusReader Symlink Arbitrary File Read",
    "summary": "nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(), domains(), categories(), or fileids() methods with the symlink filename.",
    "evidence": "osv:CVE-2026-62383",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-62383",
      "aliases": [
        "CVE-2026-62383",
        "GHSA-3hhw-38pf-pxj6",
        "PYSEC-2026-3726"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nltk/nltk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "bd49f9011d7dc8c6a36b3c4ae71f04060c9b3fb9"
                },
                {
                  "fixed": "474af1f5a94b1b8d53fc2b6defec3a2ce7633b74"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.10.0"
                      },
                      {
                        "fixed": "3.10.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.10.0"
                      },
                      {
                        "fixed": "3.10.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.10.1",
            "v.3.10.1",
            "v3.10.1-rc2",
            "v3.10.0-rc2",
            "v3.10.0",
            "v3.10.1-rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62383.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.138172411Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62383.json",
        "https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62383",
        "https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62383.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62383",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499092,
  "published_at": "2026-08-22T14:12:36.606+00:00"
}