External risk intelligence

IBM Langflow Command Execution and Sensitive File Read Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-7873

IBM Langflow is a workflow automation tool typically deployed as a web-based application or API service to manage data flows, which are commonly exposed to network or internet access for integration purposes in production environments.

Code Injection

Langflow

1.0.0 to 1.10.0

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability affects IBM Langflow, a tool used for managing data workflows. It allows authenticated users to run unauthorized commands and access sensitive files, potentially leading to full system compromise. The main concern is confirming if this technology is in use and if it is exposed.

Allows unauthorized control and data access.
Potential for system compromise.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker with authenticated access could exploit this vulnerability by sending specially crafted requests to the affected IBM Langflow component. This could allow them to execute arbitrary operating system commands on the server and access sensitive files, potentially leading to a full system compromise and the ability to move to other systems within the network.

Requires authenticated access.
Triggered by specially crafted requests.
Risk of system compromise and lateral movement.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow authenticated users to execute arbitrary operating system commands and read sensitive files, including credentials, potentially leading to a complete compromise of the affected system and enabling attackers to move laterally within a network.

System commands and sensitive files.
Authenticated user execution of commands.
Complete system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in IBM Langflow OSS affects authenticated users and allows for arbitrary OS command execution and sensitive file access, leading to system compromise. Responsibility likely falls to application owners, platform teams, and security operations, who must first identify all instances of the affected technology, determine their exposure and criticality, and then plan remediation.

Identify affected instances and owners.
Verify external reachability and business criticality.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is IBM Langflow and how is it used?

IBM Langflow is an open-source workflow automation tool. Teams typically use it to design and manage complex data flows, often deploying it as a web-based application or an API service to connect various software components in production environments.

What does CWE-94 mean regarding CVE-2026-7873?

CWE-94 refers to Improper Control of Generation of Code. In the context of CVE-2026-7873, it means the application does not properly validate user-supplied input before executing it as an operating system command, allowing an attacker to run unauthorized code on the host server.

How does an attacker trigger this vulnerability?

An attacker must have authenticated access to the application to exploit this bug. They trigger it by sending specially crafted requests to the server. Simply browsing or interacting with the service anonymously will not initiate this command execution.

Do I need to worry if my IBM Langflow instance is internal?

Halo Surface Signal identifies this as an external threat because these services are commonly exposed to network or internet access for data integration. Even if your instance is currently internal, confirm if it is accessible through any network path, as this significantly changes the risk level.

When should I prioritize fixing this software?

Start by identifying all deployed instances of IBM Langflow and determining who owns them. Once you have an inventory, assess which instances are accessible via the network and contain critical data, then work with your team to schedule necessary updates.

References

www.ibm.com/support/pages/node/7278441

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.