Critical
Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-105740
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 02:14 UTC · Revision 1
Source evidence
Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server
core-osv · Original sourcePublished 5 Oct 2026, 20:46 UTC
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.
osv:CVE-2026-105740
Complete source record
{
"id": "107150753e4aff755173a04ba0610541d1b69d17b9f404f2832036fa6b8ba6a6",
"url": "https://osv.dev/vulnerability/CVE-2026-105740",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server",
"summary": "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.",
"evidence": "osv:CVE-2026-105740",
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}
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],
"modified": "2026-10-28T02:30:46.226369502Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105740.json",
"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://nvd.nist.gov/vuln/detail/CVE-2026-105740",
"https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0",
"https://github.com/langflow-ai/langflow/pull/12290"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105740.json"
}
},
"related_cves": [
{
"value": "CVE-2026-105740",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 514185,
"published_at": "2026-10-05T20:46:18.854+00:00"
}