CVE-2026-55786— Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`
Quick assessment
Affected
flytohub flyto-core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 requi
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| flytohub | flyto-core | >= 2.26.2, < 2.26.4 |
affected |
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I. Basic Information for CVE-2026-55786
Vulnerability Information
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Vulnerability Title
Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| flytohub | flyto-core | >= 2.26.2, < 2.26.4 | - |
|
II. Public POCs for CVE-2026-55786
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-55786 (1)
Other References for CVE-2026-55786 (2)
-
Release v2.26.4 · flytohub/flyto-core · GitHub x_refsource_MISC
IV. Related Vulnerabilities
Same product: flyto-core
-
CVE-2026-55787
Flyto2 Core: SSRF guard bypass via IPv6 transition addresses -
CVE-2026-73530
Flyto2 Core < 2.28.0 SSRF Guard Bypass via is_private_ip() -
CVE-2026-67429
Flyto2 Core: Arbitrary file write via image.download (and ot -
CVE-2026-67428
Flyto2 Core: Multiple HTTP-family modules fetch client-contr -
CVE-2026-67427
Flyto2 Core: ${env.VAR} interpolation reads any env secret d
Same vendor: flytohub
-
CVE-2026-55787
Flyto2 Core: SSRF guard bypass via IPv6 transition addresses -
CVE-2026-73530
Flyto2 Core < 2.28.0 SSRF Guard Bypass via is_private_ip() -
CVE-2026-67429
Flyto2 Core: Arbitrary file write via image.download (and ot -
CVE-2026-67428
Flyto2 Core: Multiple HTTP-family modules fetch client-contr -
CVE-2026-67427
Flyto2 Core: ${env.VAR} interpolation reads any env secret d
Same weakness: CWE-78
V. Comments for CVE-2026-55786
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