CVE-2026-7871: Insecure Deserialization in Redis Cache Backend

Synopsis

This is an insecure deserialization vulnerability in IBM Langflow OSS versions 1.0.0 through 1.10.0, affecting the Redis cache backend. The vulnerability is reachable over the network, requires no authentication, and has no conditions the attacker must meet before triggering it. Successful exploitation gives an attacker arbitrary code execution with full application privileges, exposing all secrets, data, and system integrity. No upstream fix has been published yet; HarborGuard is tracking the advisory and will surface a patched rebuild the moment one becomes available.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The vulnerable component is exposed over the network; an attacker must be able to reach the service's Redis endpoint remotely to deliver a malicious serialized payload.

• AuthenticationNot required

  No credentials or account of any privilege level are required to reach the vulnerable code path.

• Victim interactionNot required

  Exploitation is entirely attacker-driven and does not require any action from a user or administrator of the affected system.

• Attack complexityDetail

  Exploit conditions are reliable and free of race conditions or environmental dependencies, meaning a prepared payload succeeds consistently against any unpatched instance.

Blast Radius

• Executes arbitrary code with full application privileges, giving the attacker complete control of the Langflow OSS process.
• Reads all application secrets, including API keys, credentials, and session tokens stored or accessible by the application.
• Modifies or destroys any data the application can access, including persisted workflow definitions and user records.
• Crashes or degrades the application and its dependent services at will, causing sustained service disruption.