Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55786
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 19:17:17 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionFlyto2 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002560000 probability, percentile 0.160670000 (date 2026-10-16)

Problem Types: CWE-78 | CWE-306 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Flytohub Flyto-core affected >= 2.26.2, < 2.26.4 Not specified

References

ReferenceSourceLinkTags
github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85 [email protected] github.com
github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f... [email protected] github.com
github.com/flytohub/flyto-core/releases/tag/v2.26.4 [email protected] github.com
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