MONAI has Path Traversal (Zip Slip) in NGC Private Bundle Download

{
  "id": "5fa0366b0251068ef91f3a4cca8f2b654bd27317579a9d8d7bb5ff6621b0f74d",
  "url": "https://osv.dev/vulnerability/CVE-2026-21851",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MONAI has Path Traversal (Zip Slip) in NGC Private Bundle Download",
    "summary": "MONAI (Medical Open Network for AI) is an AI toolkit for health care imaging. In versions up to and including 1.5.1, a Path Traversal (Zip Slip) vulnerability exists in MONAI's `_download_from_ngc_private()` function. The function uses `zipfile.ZipFile.extractall()` without path validation, while other similar download functions in the same codebase properly use the existing `safe_extract_member()` function. Commit 4014c8475626f20f158921ae0cf98ed259ae4d59 fixes this issue.",
    "evidence": "osv:CVE-2026-21851",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-21851",
      "aliases": [
        "CVE-2026-21851",
        "GHSA-9rg3-9pvr-6p27",
        "PYSEC-2026-1678"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/project-monai/monai",
              "type": "GIT",
              "events": [
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                  "introduced": "0"
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                  "fixed": "4014c8475626f20f158921ae0cf98ed259ae4d59"
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                    "cpe": "cpe:2.3:a:project-monai:monai:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "last_affected": "1.5.1"
                      }
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                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4014c8475626f20f158921ae0cf98ed259ae4d59"
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                    "source": "REFERENCES_COMMIT"
                  }
                ]
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21851.json"
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      ],
      "modified": "2026-10-28T02:30:23.379745472Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21851.json",
        "https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-21851",
        "https://github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21851.json"
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  "source_id": "core-osv",
  "document_id": 489473,
  "published_at": "2026-01-07T22:27:19.41+00:00"
}