{"id":"CVE-2026-55786","revision":"f08f1a4a4c5e428c80aaafd2089866a7","records":[{"revision":"f08f1a4a4c5e428c80aaafd2089866a7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55786","aliases":[],"title":"Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`","description":"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.","state":0,"publishedAt":"2026-10-14T18:14:39.21+00:00","modifiedAt":"2026-10-14T18:14:39.21+00:00","affected":[{"ecosystem":"Vendor product","name":"flyto-core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"flytohub\",\n                    \"product\": \"flyto-core\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.26.2, < 2.26.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85","https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e","https://github.com/flytohub/flyto-core/releases/tag/v2.26.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55786","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55786","identifiers":["CVE-2026-55786"]},"retained":false,"historicalAffected":[]}],"coverage":[]}