# CVE-2026-78575: IBM Langflow OSS command injection in MCP stdio configuration

Source: https://junglewise.ai/threats/cve-2026-78575-ibm-langflow-oss-command-injection-in-mcp-stdio-configuration  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-78575 · Severity: high · CVSS 8.8 · Published 2026-09-10

IBM Langflow OSS is an open-source platform for building AI workflows. An authenticated attacker can bypass command-line argument validation in the MCP stdio server component to execute arbitrary system commands with the privileges of the application process, potentially leading to unauthorized data access, system modification, and lateral movement.

Technologies: [IBM Langflow OSS](https://junglewise.ai/threats/technologies/langflow-oss), [Langflow](https://junglewise.ai/threats/technologies/langflow). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm), [Langflow](https://junglewise.ai/threats/vendors/langflow).

## Quick answers

**Is CVE-2026-78575 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78575 being exploited in the wild.

**How severe is CVE-2026-78575?** High severity, with a CVSS score of 8.8, published 10 September 2026.

**Which products and versions are affected?** IBM Langflow OSS 1.0.0 through 1.11.5.

**Is there a fix for CVE-2026-78575?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-78575 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-78575?** Check whether you run IBM Langflow OSS or Langflow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is an OS command injection (CWE-78) in Langflow's MCP stdio server configuration that stems from improper validation of command-line arguments. The MCP Tools component, when invoked through a flow, bypasses code-execution restriction settings, and on Windows specifically, the command validator recognizes only one cmd.exe execution switch, allowing attackers to use alternate switches to bypass the command allow-list. Exploitation requires authentication and network access to the Langflow server. Successful exploitation grants arbitrary OS command execution at the privilege level of the application process, enabling credential theft, sensitive data exposure, filesystem modification, and lateral movement to services accessible from the compromised server. Patches should validate all command-line switches and enforce consistent execution guards across all code-execution paths.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.11.5

## Timeline

- 2026-09-10: disclosed

## References

- [https://www.ibm.com/support/pages/node/7286666](https://www.ibm.com/support/pages/node/7286666)

## Related threats

- [IBM Langflow OSS path traversal arbitrary file read and write](https://junglewise.ai/threats/cve-2026-97677-ibm-langflow-oss-1-0-0-through-1-12-2-an-authenticated-flow)
- [IBM Langflow OSS authentication bypass](https://junglewise.ai/threats/cve-2026-93680-ibm-langflow-oss-1-0-0-through-1-12-8-could-allow-a-remote)
- [IBM Langflow OSS denial of service via resource exhaustion](https://junglewise.ai/threats/cve-2026-90991-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)
- [IBM Langflow OSS path traversal arbitrary file overwrite](https://junglewise.ai/threats/cve-2026-77819-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote)
- [IBM Langflow OSS improper sanitization of secrets in exports](https://junglewise.ai/threats/cve-2026-77817-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)