CVE-2026-7803: Flow Validation Bypass via Empty Component Type Field

Synopsis

This is a remote code execution vulnerability in IBM Langflow OSS versions 1.0.0 through 1.10.0, caused by improper validation of flow nodes that have missing or empty component type fields. The service is reachable over the network, requires no authentication, and no victim interaction is needed to trigger the flaw. Successful exploitation gives an attacker arbitrary code execution on the host running Langflow. No fix version has been published yet; HarborGuard tracks the advisory and will surface a patched-image rebuild the moment IBM releases one.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The vulnerable service is exposed over the network; an attacker must be able to send HTTP requests to the Langflow instance to reach the vulnerable flow-node validation path.

• AuthenticationNot required

  No account or credential is needed; the vulnerable endpoint can be reached and exploited by an unauthenticated attacker.

• Victim interactionNot required

  Exploitation is fully attacker-driven and requires no action from any user of the affected system.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and does not depend on race conditions, special memory layout, or other environmental factors.

Blast Radius

• An attacker executes arbitrary code in the context of the Langflow server process, with whatever OS-level permissions that process holds.
• All data accessible to the Langflow process, including stored flows, credentials, and connected data sources, is readable by the attacker.
• The attacker can write or delete files and modify persisted application state on the host filesystem.
• The attacker can crash or hang the Langflow service, causing a full denial of service for all users of that instance.