What’s Vulnerable › Vulnerabilities

CVE-2026-105740: Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-05 · updated 2026-10-06
• Weakness: CWE-78

Description

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 products

• IBM Langflow OSS: before 1.9.0

References

• https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0
• https://github.com/langflow-ai/langflow/pull/12290
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45

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