Critical 9.9Published Oct 5, 2026

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

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects langflow-ai langflow. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.59%, higher than 47% of scored CVEs.

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Every CVE for langflow-ai langflow

Exploited in the last 30 days

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: 9.9 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.59% (percentile 47)
Assigned by: GitHub_M
NVD analysis: Undergoing Analysis
Record last updated: Oct 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

langflow-ai langflow langflow_ai:langflow (from the name)	before 1.9.0	CNA record

References

https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2x-refsource-confirm
https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45x-refsource-misc
https://github.com/langflow-ai/langflow/pull/12290x-refsource-misc
https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.