CVE-2026-105740criticalCWE-78

CVE-2026-105740: critical vulnerability in langflow-ai langflow

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

Published · Updated

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.9epss 0.6%
exploitation probability
0.6%top 54% of all CVEs
observed exploitation
nono source reports it
Langflow 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
langflow-ai · langflow
Related CVEs — langflow-ai langflow

In the same product, most dangerous first.

CVE-2025-3248CRITICALLangflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/codeEPSS 100.0%KEVCVE-2026-33017CRITICALLangflow has Unauthenticated Remote Code Execution via Public Flow Build EndpointEPSS 24.8%KEVCVE-2026-55255HIGHLangflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's FlowEPSS 0.9%KEVCVE-2026-21445HIGHLangflow Missing Authentication on Critical API EndpointsEPSS 33.3%CVE-2025-68477HIGHLangflow vulnerable to Server-Side Request ForgeryEPSS 6.3%CVE-2025-68478HIGHLangflow Vulnerable to External Control of File Name or PathEPSS 5.8%
References
https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0https://github.com/langflow-ai/langflow/pull/12290https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45