NetBox Device Type Library: Module Shadowing Bypass of prior pickle fix - RCE via missing `tests/__init__.py` + SSRF via unfixed `NETBOX_DT_LIBRARY_URL` → Cloud Metadata credential theft

{
  "id": "af797617fdef3e8eb029db982aa3d603ace71461613e51c28bc790f2bfe253ea",
  "url": "https://osv.dev/vulnerability/CVE-2026-54916",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NetBox Device Type Library: Module Shadowing Bypass of prior pickle fix - RCE via missing `tests/__init__.py` + SSRF via unfixed `NETBOX_DT_LIBRARY_URL` → Cloud Metadata credential theft",
    "summary": "NetBox Device Type Library is a collection of community-sourced device type definitions for import into NetBox. The absence of tests/init.py and the lack of --import-mode=importlib cause pytest prepend import mode to place the tests directory at the front of sys.path during collection. An unauthenticated contributor can add a module such as tests/git.py that shadows GitPython when tests/definitions_test.py executes from git import Git, Repo, or add tests/conftest.py for automatic collection-time execution. Python imports and runs the pull-request module before any test function, allowing arbitrary code execution on the GitHub Actions runner, test-result tampering, and access to tokens or network resources exposed to the workflow. This module-shadowing path is independent of the earlier pickle deserialization flaw and the separately tracked NETBOX_DT_LIBRARY_URL issue. This vulnerability is fixed by commit b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037.",
    "evidence": "osv:CVE-2026-54916",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-54916",
      "aliases": [
        "CVE-2026-54916",
        "GHSA-wwg5-825x-83g6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/netbox-community/devicetype-library",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54916.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.702403924Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54916.json",
        "https://github.com/netbox-community/devicetype-library/security/advisories/GHSA-wwg5-825x-83g6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54916",
        "https://github.com/netbox-community/devicetype-library/commit/b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037",
        "https://github.com/netbox-community/devicetype-library/pull/4239"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-427",
          "CWE-829"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037g"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54916.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54916",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508083,
  "published_at": "2026-09-17T20:01:14.294+00:00"
}