CVE-2026-55786 Details
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.
A vulnerability in Flyto2 Core versions 2.26.2 prior to 2.26.4 allows for unauthenticated execution of arbitrary operating system commands. This issue arises because the HTTP MCP POST /mcp route accepts JSON-RPC tools/call requests without requiring authentication, and forwards the execute_module arguments to the module registry. An unauthenticated caller can exploit this by selecting sandbox.execute_shell and providing a command, which is executed with the privileges of the Flyto Core server process. The vulnerability is present by default when the server is bound to the loopback interface, but can be exposed to the network if an operator binds it to a non-loopback interface.
Users are advised to update to Flyto2 Core version 2.26.4 or later, and to ensure that the server is not exposed to the network without authentication.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 14, 2026CISA-ADP
Assessed Oct 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85 | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e | [email protected] | Source CodeVendor |
| https://github.com/flytohub/flyto-core/releases/tag/v2.26.4 | [email protected] | Release NotesVendor |
| https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
| CWE-78 | Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Flyto2 Core | >= 2.26.2, < 2.26.4 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 29, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | New CVE Received | [email protected] |