External risk intelligence

IBM Langflow OSS Arbitrary Code Execution via Improper Flow Node Validation.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-7803

IBM Langflow is a visual development tool often deployed as a web-based application or service to facilitate workflow automation and AI model orchestration. These types of platforms are commonly exposed as web interfaces or API endpoints for team access, making internet or intranet-wide reachability a typical deployment pattern.

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 advisory details a critical vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.10.0. The issue stems from improper validation of certain components within the software, potentially allowing for the execution of arbitrary code. While specific business impacts are not yet detailed, the technology's role in workflow automation and AI model orchestration suggests a need to assess its relevance and exposure within our environment.

Code execution flaw in workflow tool.
Affects AI orchestration and automation platforms.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a crafted request to an exposed IBM Langflow instance. This request would target the flow node processing, specifically when component types are not properly validated. If successful, this could lead to arbitrary code execution on the server.

No authentication or special access required.
Malicious flow nodes trigger the vulnerability.
Arbitrary code execution risk.

Live Threat

Current exploitation, exposure, and threat context

IBM Langflow OSS, when improperly configured, could allow an attacker to execute arbitrary code. This may occur if the system does not properly validate flow nodes, particularly those with missing or empty component type fields. The potential impact depends on how the affected system is deployed and accessed.

Arbitrary code execution.
Exploits missing validation of flow nodes.
System compromise and data access.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts IBM Langflow OSS, likely managed by platform or application teams responsible for workflow automation and AI model orchestration. The first step is to identify all instances of IBM Langflow OSS within your environment, determine their exposure (internet-facing or internal), and confirm their business criticality. Once identified and prioritized, engage the accountable owner to plan remediation, which may involve vendor coordination or temporary risk reduction measures.

Platform or application owners should manage the issue.
Verify affected instances and their reachability.
Plan remediation based on risk and criticality.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is IBM Langflow OSS?

IBM Langflow OSS is a visual development tool designed for building workflow automation and orchestrating AI models. Users interact with its interface to visually connect components into functional flows, often deploying it as a web-based service for teams to manage complex automation tasks and AI processes.

What does CVE-2026-7803 mean?

This CVE describes a critical vulnerability classified as Improper Input Validation (CWE-20). It occurs because the software fails to properly check flow nodes that have missing or empty component type fields. This logic error allows the system to process malformed data as valid, which can lead to the unauthorized execution of arbitrary code on the underlying server.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specially crafted request to the Langflow instance that contains malformed flow nodes. The vulnerability specifically targets the processing of components lacking a defined type. Simply browsing the interface or sending legitimate, well-formed flow configurations does not trigger the execution of unauthorized code.

Do I need to worry if my instance is internal?

According to Halo Surface Signal, this vulnerability is classified as external because the software is frequently deployed as a web interface or API endpoint. While internet-facing instances are at the highest risk due to ease of access, internal instances may still be reachable by unauthorized users within your network, requiring you to confirm their specific reachability.

When should I address this vulnerability?

You should prioritize identifying all IBM Langflow OSS instances in your environment immediately. Since this flaw allows for arbitrary code execution, determine which instances are critical to your business operations and assess their network exposure. Once your inventory is clear, coordinate with the responsible platform owners to plan and implement necessary remediation steps.

References

www.ibm.com/support/pages/node/7278445

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.