NetLicensing MCP Server: REST Path Traversal Bypasses Token Redaction

{
  "id": "dae02dea1857ee79a862c2996e6dccda6cfc93b622b1875341092f6aa580c2fe",
  "url": "https://osv.dev/vulnerability/CVE-2026-57496",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NetLicensing MCP Server: REST Path Traversal Bypasses Token Redaction",
    "summary": "NetLicensing MCP Server is a natural-language interface that enables agentic applications to manage the software-licensing lifecycle in Labs64 NetLicensing. Prior to 0.1.8, netlicensing_get_product passes the caller-controlled product_number to src/netlicensing_mcp/tools/products.py, which interpolates it into a REST path consumed by nl_get() in src/netlicensing_mcp/client.py without path-segment validation. A traversal segment can be normalized from the intended product path to the /token endpoint, after which the response is serialized through _wrap_json instead of _wrap_json_token_read, bypassing redact_token_read() protections for APIKEY number and SHOP shopURL fields. An authenticated MCP client with a non-administrative API key can retrieve plaintext token values, and a recovered administrative token can provide broad read, write, and delete access to the NetLicensing account. This issue is fixed in version 0.1.8.",
    "evidence": "osv:CVE-2026-57496",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-57496",
      "aliases": [
        "CVE-2026-57496",
        "GHSA-hxpf-9xvq-wph8",
        "PYSEC-2026-3489"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/labs64/netlicensing-mcp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b8fd0ea76d533202573eb24add9fb2fbd9331496"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.1.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b8fd0ea76d533202573eb24add9fb2fbd9331496"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b8fd0ea76d533202573eb24add9fb2fbd9331496"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.1.8"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.1.8"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.1.7",
            "0.1.6",
            "0.1.5",
            "0.1.4",
            "0.1.3",
            "0.1.2",
            "0.1.1",
            "0.1.0",
            "0.0.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57496.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.178164691Z",
      "provider": "osv",
      "references": [
        "https://github.com/Labs64/NetLicensing-MCP/releases/tag/0.1.8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57496.json",
        "https://github.com/Labs64/NetLicensing-MCP/security/advisories/GHSA-hxpf-9xvq-wph8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-57496",
        "https://github.com/Labs64/NetLicensing-MCP/commit/b8fd0ea76d533202573eb24add9fb2fbd9331496",
        "https://github.com/Labs64/NetLicensing-MCP/pull/6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57496.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57496",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497262,
  "published_at": "2026-10-15T18:40:16.558+00:00"
}