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.
History

Thu, 29 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 17 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Flytohub
Flytohub flyto-core
Vendors & Products Flytohub
Flytohub flyto-core

Wed, 14 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
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.
Title Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`
Weaknesses CWE-306
CWE-78
References
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-14T18:14:39.210Z

Updated: 2026-10-29T13:49:14.344Z

Reserved: 2026-06-17T14:40:28.380Z

Link: CVE-2026-55786

cve-icon Vulnrichment

Updated: 2026-10-29T13:48:38.473Z

cve-icon NVD

Status : Deferred

Published: 2026-10-14T19:17:17.777

Modified: 2026-10-29T14:17:57.017

Link: CVE-2026-55786

cve-icon Redhat

No data.