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CVE-2026-105697

CRITICAL 9.9

Published 2026-10-05 · Last modified 2026-10-09

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.

ELEVATED IMPACT

Severe if exploited (CVSS 9.9), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.8%chance of exploitation in 30 days · 56th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

9.9CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Langflow Ai

Products Langflow Langflow Base Lfx

Weakness (CWE)

  • CWE-78: : Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • langflow PyPI

    pkg:pypi/langflow

    ECOSYSTEM range
    • Introduced version (included): 1.1.2
    • Fixed boundary (excluded): 1.10.3
    62 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-w794-rj3p-xv45/GHSA-w794-rj3p-xv45.json"
  }
}
    GitHub Advisory Database · GHSA-w794-rj3p-xv45 · Updated 2026-10-15T14:55:59.006765723Z
  • langflow-base PyPI

    pkg:pypi/langflow-base

    ECOSYSTEM range
    • Introduced version (included): 0.1.2
    • Fixed boundary (excluded): 0.10.3
    62 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-w794-rj3p-xv45/GHSA-w794-rj3p-xv45.json"
  }
}
    GitHub Advisory Database · GHSA-w794-rj3p-xv45 · Updated 2026-10-15T14:55:59.006765723Z
  • lfx PyPI

    pkg:pypi/lfx

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 1.10.3
    46 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-w794-rj3p-xv45/GHSA-w794-rj3p-xv45.json"
  }
}
    GitHub Advisory Database · GHSA-w794-rj3p-xv45 · Updated 2026-10-15T14:55:59.006765723Z
  • langflow PyPI

    pkg:pypi/langflow

    ECOSYSTEM range
    • Introduced version (included): 1.1.2
    • Fixed boundary (excluded): 1.10.3
    62 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-4237.yaml"
  }
}
    PyPA · PYSEC-2026-4237 · Updated 2026-10-15T14:55:59.006765723Z
  • langflow-base PyPI

    pkg:pypi/langflow-base

    ECOSYSTEM range
    • Introduced version (included): 0.1.2
    • Fixed boundary (excluded): 0.10.3
    62 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/langflow-base/PYSEC-2026-4239.yaml"
  }
}
    PyPA · PYSEC-2026-4239 · Updated 2026-10-15T14:55:59.006765723Z
  • lfx PyPI

    pkg:pypi/lfx

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 1.10.3
    46 explicitly listed affected 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

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/lfx/PYSEC-2026-4241.yaml"
  }
}
    PyPA · PYSEC-2026-4241 · Updated 2026-10-15T14:55:59.006765723Z

All CVSS metrics

  • CRITICAL 9.9 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • CRITICAL 9.9 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS