NLTK before 3.10.3 SSRF Protection Bypass via Proxy

{
  "id": "451b0ad56b5e7310323f9df3a691625df568b33d3b1803d507d27c7fcb390819",
  "url": "https://osv.dev/vulnerability/CVE-2026-78682",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NLTK before 3.10.3 SSRF Protection Bypass via Proxy",
    "summary": "NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen (and callers nltk.data.load, nltk.downloader.Downloader.index/download) when an HTTP proxy is configured. pathsec.urlopen validates the requested hostname locally, but proxy-handler inheritance disables the safe HTTP/HTTPS handlers so the actual fetch is performed by the proxy against a destination that is never re-validated. An attacker can supply a validated public URL that the proxy forwards to an internal loopback-only service, allowing disclosure of internal HTTP resources, loading of forged downloader indexes, and installation of attacker-chosen package content.",
    "evidence": "osv:CVE-2026-78682",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-78682",
      "aliases": [
        "CVE-2026-78682",
        "GHSA-6ww7-3frv-cqxh",
        "PYSEC-2026-3733"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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": "0"
                },
                {
                  "fixed": "303f6e2ba8e4548a5f54fd65d86bb5c9a949f1db"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.10.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.10.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.10.2-rc1",
            "v3.10.2",
            "v3.10.1",
            "v.3.10.1",
            "v3.10.1-rc2",
            "v3.10.0-rc2",
            "v3.10.0",
            "v3.10.1-rc1",
            "v3.10.0-rc1",
            "3.9.4",
            "3.9.3",
            "v3.9.2",
            "3.9.2",
            "3.9.1",
            "3.9",
            "3.8.2",
            "3.8.1",
            "3.8",
            "3.7",
            "3.6.7",
            "3.6.6",
            "3.6.5",
            "3.6.2",
            "3.6.1",
            "3.6",
            "3.5",
            "3.5b1",
            "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-2026-78682.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.095157782Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78682.json",
        "https://github.com/nltk/nltk/security/advisories/GHSA-6ww7-3frv-cqxh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-78682",
        "https://www.vulncheck.com/advisories/nltk-before-ssrf-protection-bypass-via-proxy"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78682.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-78682",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487248,
  "published_at": "2026-08-25T01:30:38.486+00:00"
}