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TI-2026-68351 Aliases CVE-2026-105740

Remote code execution in Langflow via MCP Stdio transport

Priority HIGH 76CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

Langflow before 1.9.0 does not validate the command of an MCP server added with the Stdio transport, and the command is passed to a shell (CWE-78). Any authenticated user can run arbitrary operating system commands on the server, and the command runs as soon as the server list is fetched. The env field also lets users inject arbitrary environment variables, such as LD_PRELOAD or PATH.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.03885 90th percentileScored 2026-11-07
Fix Fixed langflow (langflow-ai): 1.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Langflowlangflowbefore 1.9.01.9.0Patch availableCNA
  • langflow VendorLangflow Affected before 1.9.0 Fixed in 1.9.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*——Langflow
  • cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* Versions — — ·Langflow

Remediation

Upgrade Langflow to version 1.9.0 or later, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA langflow (langflow-ai) Fixed in 1.9.0

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105740
  2. 2026-10-06 CISA SSVC decision points changed
  3. 2026-10-06 Priority changed: MEDIUM → HIGH
  4. 2026-10-25 EPSS moved to the 50th–90th percentile
  5. 2026-11-04 EPSS moved to the 90th–95th percentile

References

Other 4

  • TI-2026-08085 Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00553 Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote… KEVCVSS 3.0CRITICAL 9.8
  • TI-2025-24427 Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE KEVCVSS 4.0CRITICAL 9.4
  • TI-2025-02845 Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-25463 Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-39928 Authorization bypass in langflow KEVCVSS 3.1HIGH 8.4
See all 236 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences