{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.26.2"
              },
              {
                "fixed": "2.26.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "db7f116b1d3c5dcf94aded00d14118f81f3e225e"
            },
            {
              "fixed": "50d0d327a1278c8cec9495ba5f6f010dd67ef19c"
            }
          ],
          "repo": "https://github.com/flytohub/flyto-core",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h9f9-h6gm-wc85"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-306",
      "CWE-78"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55786.json"
  },
  "details": "Flyto2 Core is an execution kernel for automation and AI-agent workflows. From 2.26.2 until 2.26.4, the HTTP MCP POST /mcp route accepts unauthenticated JSON-RPC tools/call requests and forwards execute_module arguments to the module registry without the require_auth dependency used by the REST execution routes. An unauthenticated caller can select sandbox.execute_shell and supply its command parameter, which reaches asyncio.create_subprocess_shell with the privileges of the flyto-core server process. The endpoint is reachable locally under the default loopback binding and becomes network reachable when an operator binds the server to a non-loopback interface, allowing arbitrary OS command execution and potential full host compromise. This issue is fixed in version 2.26.4.",
  "id": "CVE-2026-55786",
  "modified": "2026-10-16T02:31:19.405968212Z",
  "published": "2026-10-14T18:14:39.210Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flytohub/flyto-core/releases/tag/v2.26.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55786.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55786"
    },
    {
      "type": "FIX",
      "url": "https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`"
}