Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-105740
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. Prior to 1.9.0, any authenticated Langflow user can achieve Remote Code Execution (RCE) on the server by adding an MCP server with the "Stdio" transport. The user-supplied command field is passed directly to bash -c "exec {command}" with zero validation, no allowlisting, and no sandboxing. The command executes immediately when the server list is fetched. Additionally, the env field allows arbitrary environment variable injection (e.g., LD_PRELOAD, PATH override). This vulnerability is fixed in 1.9.0.

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 < 1.9.0 Not specified

References

ReferenceSourceLinkTags
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/security/advisories/GHSA-7w94-79vh-5mr2 [email protected] github.com
github.com/langflow-ai/langflow/pull/12290 [email protected] github.com
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