p PatchFirst

CVE-2026-105697

CVE-2026-105697 · Langflow: OS command injection (RCE) via arbitrary command in MCP stdio server configuration

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Langflow is a tool for building and deploying AI-powered agents and workflows. Before Langflow 1.10.3, the MCP stdio transport launched whatever command / args a user put in an MCP server configuration, with no allowlist and (before 1.10.3) wrapped in bash -c "exec {command} ...". Any user able to reach the MCP server settings ("Settings → MCP Servers → Add MCP Server", POST/PATCH /api/v2/mcp/servers/{server_name}) or to build a flow with the MCP Tools component could add a "server" whose command is an arbitrary OS command (touch, rm -rf, a reverse shell, ...). The command runs on the Langflow host as the Langflow process user as soon as Langflow tries to connect to the server (listing servers, loading tools, running the flow) — even when the UI then reports that the stdio server failed to start. With the default LANGFLOW_AUTO_LOGIN=true, GET /api/v1/auto_login hands out a token without credentials, so on an exposed instance running the default configuration this is reachable without an account. AUTO_LOGIN is documented as a development-only setting; with it disabled, any authenticated (non-admin) user can exploit it. This issue is fixed in Langflow 1.10.3, langflow-base 0.10.3, and lfx 1.10.3.

CVSS 9.9 · Critical · EPSS 0.5% · Public exploit · Fix available

Published
Updated

Stack: python

Affected products and versions

  • langflow

    Versions
    • >= 1.1.2, < 1.10.3: Affected

    No fix published

  • langflow-base

    Versions
    • >= 0.1.2, < 0.10.3: Affected

    No fix published

  • lfx

    Versions
    • < 1.10.3: Affected

    No fix published

  • langflow PyPI

    Versions
    • 1.1.2
    • 1.1.3
    • 1.1.4
    • 1.1.4.post1
    • 1.10.0
    • 1.10.0rc0
    • 1.10.1
    • 1.10.1rc0
    • 1.10.1rc3
    • 1.10.2
    • 1.10.2rc4
    • 1.10.3rc0
    • 1.2.0
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.4.0
    • 1.4.1
    • 1.4.2
    • 1.4.3
    • 1.5.0
    • 1.5.0.post1
    • 1.5.0.post2
    • 1.5.1
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.6.5
    • 1.6.6
    • 1.6.7
    • 1.6.8
    • 1.6.9
    • 1.7.0
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.8.0
    • 1.8.0rc0
    • 1.8.0rc1
    • 1.8.0rc2
    • 1.8.0rc3
    • 1.8.0rc4
    • 1.8.0rc5
    • 1.8.0rc6
    • 1.8.1
    • 1.8.2
    • 1.8.3
    • 1.8.3rc0
    • 1.8.4
    • 1.9.0
    • 1.9.1
    • 1.9.2
    • 1.9.3
    • 1.9.3rc0
    • 1.9.4
    • 1.9.5
    • 1.9.6
    • 1.9.6rc0
    Affected ranges
    • ECOSYSTEM: ≥ 1.1.2, < 1.10.3

    Update to 1.10.3

  • langflow-base PyPI

    Versions
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.4.post1
    • 0.10.0
    • 0.10.0rc0
    • 0.10.1
    • 0.10.1rc0
    • 0.10.1rc3
    • 0.10.2
    • 0.10.2rc4
    • 0.10.3rc0
    • 0.2.0
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.5.0
    • 0.5.0.post1
    • 0.5.0.post2
    • 0.5.1
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.6.3
    • 0.6.4
    • 0.6.5
    • 0.6.6
    • 0.6.7
    • 0.6.8
    • 0.6.9
    • 0.7.0
    • 0.7.1
    • 0.7.2
    • 0.7.3
    • 0.8.0
    • 0.8.0rc0
    • 0.8.0rc1
    • 0.8.0rc2
    • 0.8.0rc3
    • 0.8.0rc4
    • 0.8.0rc5
    • 0.8.0rc6
    • 0.8.1
    • 0.8.2
    • 0.8.3
    • 0.8.3rc0
    • 0.8.4
    • 0.9.0
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.3rc0
    • 0.9.4
    • 0.9.5
    • 0.9.6
    • 0.9.6rc0
    Affected ranges
    • ECOSYSTEM: ≥ 0.1.2, < 0.10.3

    Update to 0.10.3

  • lfx PyPI

    Versions
    • 0.1.0
    • 0.1.1
    • 0.1.10
    • 0.1.11
    • 0.1.13
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.3.0
    • 0.3.0rc0
    • 0.3.0rc1
    • 0.3.0rc2
    • 0.3.0rc3
    • 0.3.0rc4
    • 0.3.0rc5
    • 0.3.0rc6
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.3rc0
    • 0.3.4
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.3rc0
    • 0.4.4
    • 0.4.5
    • 0.4.6
    • 0.4.6rc0
    • 1.10.0
    • 1.10.0rc0
    • 1.10.1
    • 1.10.1rc0
    • 1.10.1rc3
    • 1.10.2
    • 1.10.2rc4
    • 1.10.3rc0
    Affected ranges
    • ECOSYSTEM: < 1.10.3

    Update to 1.10.3

Original sources

Check your server →