Paper/Archive/CVE-2026-105740

CVE-2026-105740

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

EPSS 1%public exploit CVSS 9.9

critical.is priorityof 100

CVSS 9.9 (CNA)9.9 / 10 × 3029.7 Not in CISA KEV+300.0 EPSS percentile 64.2.642 × 2012.8 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

langflow< 1.9.0–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2 exploitgithub.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45 refgithub.com/langflow-ai/langflow/pull/12290 refgithub.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0