CVE-2026-55786
CVE-2026-55786 · Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.4 · High · EPSS 0.3% · Fix available
- Published
- Updated
Stack: python
Affected products and versions
flyto-core
- Versions
- >= 2.26.2, < 2.26.4: Affected
No fix published
flyto-core PyPI
- Versions
- 2.26.2
- 2.26.3
- Affected ranges
- ECOSYSTEM: ≥ 2.26.2, < 2.26.4
Update to 2.26.4