Langflow: OS command injection (RCE) via arbitrary command in MCP stdio server configuration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-105697
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-05 21:16:35 UTC
Updated2026-10-05 21:16:35 UTC
DescriptionLangflow is a tool for building and deploying AI-powered agents and workflows. Before Langflow 1.10.3, the MCP stdio transport launched whatever command / args a user put in an MCP server configuration, with no allowlist and (before 1.10.3) wrapped in bash -c "exec {command} ...". Any user able to reach the MCP server settings ("Settings → MCP Servers → Add MCP Server", POST/PATCH /api/v2/mcp/servers/{server_name}) or to build a flow with the MCP Tools component could add a "server" whose command is an arbitrary OS command (touch, rm -rf, a reverse shell, ...). The command runs on the Langflow host as the Langflow process user as soon as Langflow tries to connect to the server (listing servers, loading tools, running the flow) — even when the UI then reports that the stdio server failed to start. With the default LANGFLOW_AUTO_LOGIN=true, GET /api/v1/auto_login hands out a token without credentials, so on an exposed instance running the default configuration this is reachable without an account. AUTO_LOGIN is documented as a development-only setting; with it disabled, any authenticated (non-admin) user can exploit it. This issue is fixed in Langflow 1.10.3, langflow-base 0.10.3, and lfx 1.10.3.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

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

Problem Types: CWE-78 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langflow-ai Langflow affected >= 1.1.2, < 1.10.3 Not specified
CNA Langflow-ai Langflow-base affected >= 0.1.2, < 0.10.3 Not specified
CNA Langflow-ai Lfx affected < 1.10.3 Not specified

References

ReferenceSourceLinkTags
github.com/langflow-ai/langflow/pull/14036 [email protected] github.com
github.com/langflow-ai/langflow/releases/tag/v1.10.3 [email protected] github.com
github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45 [email protected] github.com
github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0... [email protected] github.com
github.com/langflow-ai/langflow/pull/12290 [email protected] github.com
github.com/langflow-ai/langflow/commit/eba285edf1dd4a33bf23a9cb8113c991f... [email protected] github.com
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