Security advisory

{
  "id": "2bc84dc0578447edc49dc4f7832a8e636a4b235b9cc16a9b7d43c80d2ded8c8a",
  "url": "https://osv.dev/vulnerability/CVE-2026-18482",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-18482",
    "summary": "Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.",
    "evidence": "osv:CVE-2026-18482",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-18482",
      "aliases": [
        "CVE-2026-18482"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/neomjs/neo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5acc564ea1b278bca5fab1f8f397a6ba9b849d75"
                },
                {
                  "fixed": "88c77fc4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "5acc564ea1b278bca5fab1f8f397a6ba9b849d75"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "88c77fc4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18482.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.402145470Z",
      "provider": "osv",
      "references": [
        "https://novice-22.com/posts/neo-mjs/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18482.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18482",
        "https://github.com/neomjs/neo/commit/5acc564ea1b278bca5fab1f8f397a6ba9b849d75",
        "https://github.com/neomjs/neo/commit/88c77fc4"
      ],
      "provider_metadata": {
        "cna_assigner": "certcc",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "88c77fc4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18482.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-18482",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499515,
  "published_at": "2026-08-20T12:36:40.567+00:00"
}