External risk intelligence

IBM Langflow OSS Code Injection Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-12946

IBM Langflow is a visual development tool for building AI/LLM workflows, which are frequently deployed as web-based applications, API endpoints, or developer portals. These services are commonly hosted on infrastructure that is reachable via the internet to allow for remote collaboration and API integration, making the attack surface commonly exposed in real-world deployments.

Code Injection

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

A critical vulnerability has been identified in IBM Langflow OSS, a tool for building AI workflows. This issue could allow unauthorized individuals to execute their own code remotely, posing a significant risk to systems using this technology. The primary concern is to confirm if our environment utilizes this affected software, as the potential for remote code execution requires careful attention.

Code execution risk in AI workflow tool.
Confirms relevance and exposure to this specific threat.
Prioritize confirmation of use and potential impact.

Attack Path

How an attacker could exploit the issue

An attacker could target IBM Langflow OSS by sending specially crafted input to a web-facing application. This input could exploit how the software processes user-provided code, potentially allowing the attacker to execute arbitrary commands on the server. If successful, this could lead to the compromise of sensitive data, modification of system settings, or disruption of the application's services.

Requires unauthenticated network access.
Triggers via improper user input handling.
Leads to arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

A critical vulnerability in IBM Langflow OSS could allow a remote attacker with low privileges to inject and execute arbitrary code on the system when specific user input is not properly controlled. This could impact the integrity and availability of the affected system.

Arbitrary code execution on the system.
Unsanitized user input allows injection.
Compromised system integrity and availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

IBM Langflow OSS, a tool for building AI/LLM workflows, is likely deployed as a web application or API accessible remotely. Responsibility for addressing this critical vulnerability will likely fall to teams managing the application (Application Owners), the underlying infrastructure (Infrastructure/Platform Teams), and those overseeing security and network access (Network/Security Teams). The immediate priority is to identify all instances of the affected technology, assess their exposure and business criticality, and assign ownership for remediation.

Application and platform teams own this issue.
Verify external reachability and criticality first.
Plan remediation or mitigation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is IBM Langflow OSS?

IBM Langflow OSS is a visual development platform designed for creating and managing AI and Large Language Model (LLM) workflows. It provides a drag-and-drop interface that simplifies the construction of complex data pipelines, which developers and data scientists often deploy as interactive web applications, internal API endpoints, or centralized portals for team collaboration.

How does CVE-2026-12946 cause code injection?

This vulnerability is categorized under CWE-94, which refers to Improper Control of Generation of Code. In the context of this CVE, the software fails to properly sanitize or restrict user-provided input before processing it. This weakness allows an attacker to supply malicious input that the system inadvertently interprets as executable commands, granting the attacker the ability to run arbitrary code directly on the host server.

Does any input trigger this code execution?

Execution is not triggered by arbitrary or benign data. The vulnerability specifically requires the submission of specially crafted, malicious input designed to exploit the software's input handling mechanism. If the provided input does not contain the necessary structure to bypass validation and manipulate code generation, the vulnerability will not be triggered.

Why is this vulnerability considered internet-facing?

Halo Surface Signal indicates that IBM Langflow is frequently deployed as web-based applications or API services. Because these services are often hosted on infrastructure reachable via the internet to support remote collaboration and external API integrations, the attack surface is commonly exposed to remote actors, increasing the likelihood that a system could be targeted.

How do I address this critical vulnerability?

Start by identifying every instance of IBM Langflow OSS running within your infrastructure to determine which versions are deployed. Assess each instance based on its network reachability and the sensitivity of the data it handles. Once you have a clear inventory, coordinate with your application and infrastructure teams to prioritize remediation, applying available updates provided by the vendor to secure the software against unauthorized code execution.

References

www.ibm.com/support/pages/node/7278928

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.