{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55786",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T14:40:28.380Z",
        "datePublished": "2026-10-14T18:14:39.210Z",
        "dateUpdated": "2026-10-14T18:14:39.210Z"
    },
    "containers": {
        "cna": {
            "title": "Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-78",
                            "lang": "en",
                            "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-306",
                            "lang": "en",
                            "description": "CWE-306: Missing Authentication for Critical Function",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "LOCAL",
                        "availabilityImpact": "HIGH",
                        "baseScore": 8.4,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85"
                },
                {
                    "name": "https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e"
                },
                {
                    "name": "https://github.com/flytohub/flyto-core/releases/tag/v2.26.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/flytohub/flyto-core/releases/tag/v2.26.4"
                }
            ],
            "affected": [
                {
                    "vendor": "flytohub",
                    "product": "flyto-core",
                    "versions": [
                        {
                            "version": ">= 2.26.2, < 2.26.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-14T18:14:39.210Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-h9f9-h6gm-wc85",
                "discovery": "UNKNOWN"
            }
        }
    }
}