CVE-2026-0770: Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability

CVE-2026-0770 is an inclusion-of-functionality-from-untrusted-control-sphere weakness in Langflow that can let a remote attacker run arbitrary code on affected installations. For teams running Langflow in development, automation, or production workflows, successful abuse can mean full host compromise, so inventory and remediation should be treated as high priority until the vendor fix is confirmed and applied.

Public detail is limited to the CWE class and the CISA description of remote code execution; exact affected builds, attack preconditions, and scoring must be taken from the vendor advisory rather than assumed.

How it works

This issue is tracked as CWE-829: inclusion of functionality from an untrusted control sphere. In products of this class, the application loads or executes code, modules, or other functional components from a source the attacker can influence—such as a path, URL, package reference, or configuration value that is not adequately restricted to a trusted set.

When that control is missing or weak, a remote attacker who can supply or redirect that reference may cause the application to pull in and run attacker-chosen functionality in the context of the Langflow process. The CISA summary states that this can result in arbitrary code execution on affected installations. Specific request shapes, authentication requirements, and payload mechanics are not provided in the given facts and must be confirmed against the vendor advisory; defenders should assume a remote path to code execution until the advisory narrows the conditions.

Am I affected? How to find it in your systems

Langflow is typically deployed as a service or application stack used for building and running LLM/flow-based workloads—often on developer workstations, internal app servers, containers, or cloud instances that may be reachable from broader networks. Treat any host or cluster that runs Langflow as in scope until proven otherwise.

• Inventory: search configuration management, container registries, orchestration manifests, package inventories, and process lists for Langflow-related images, packages, and services. Check reverse proxies and load balancers that front Langflow UI or API ports.
• Versions and configuration: compare installed builds and deployment options to the fixed and vulnerable ranges in the vendor advisory. Note any settings that allow loading external code, custom components, remote resources, or user-supplied paths—common risk surfaces for CWE-829-style flaws.
• Exposure: identify internet-facing or broadly reachable instances first; CISA guidance emphasizes evaluating each asset’s internet exposure when prioritizing.
• Telemetry: review application and web-server logs for unusual requests that reference external modules, unexpected file or URL loads, sudden process spawns, or outbound connections from the Langflow host around the time of suspicious access. Host EDR alerts for child processes or script interpreters launched by the Langflow service are also worth correlating. Absence of known public exploit signatures does not rule out abuse.

How to remediate

Patch first. Apply the vendor-supplied update or mitigation for CVE-2026-0770 exactly as described in the Langflow advisory, and verify the installed version or build hash afterward. Align prioritization with CISA BOD 26-04 risk-based update guidance and any applicable forensics-triage expectations for your environment. For cloud-hosted or managed instances, follow the same BOD 26-04 cloud guidance or discontinue use if mitigations cannot be applied.

• After patching, restart services cleanly and confirm the vulnerable code path is no longer present.
• Restrict where Langflow may load functionality: allow only signed or explicitly allow-listed components, disable remote or user-controlled module inclusion if the product permits, and run the service with least privilege.
• Harden the deployment: place Langflow behind authenticated access, limit network peers to administrators and necessary backends, and keep the host and container base images current.
• Re-scan inventories so no secondary or forgotten instances remain on old builds.

If you can't patch immediately

Reduce reachability and monitor aggressively until the vendor fix is in place.

• Segmentation: remove internet exposure; bind to internal interfaces only and allowlist management networks at the firewall or security group.
• Access control: require strong authentication and, where possible, put a reverse proxy or zero-trust broker in front of the UI and APIs.
• Feature reduction: disable any configuration that loads external or user-specified functionality, custom components, or remote resources if the product allows it without breaking critical use.
• Virtual patching / WAF: if you have a WAF or reverse-proxy rules engine, block request patterns that attempt to inject external references or suspicious inclusion parameters—tuned from the vendor’s description once available, not from guesswork.
• Monitoring: alert on new child processes from the Langflow service, unexpected outbound connections, and authentication anomalies; retain logs for incident review.
• If no reliable mitigation exists for a given deployment, plan to take the instance offline or replace the workflow until a patch can be applied, consistent with CISA’s direction to discontinue use when mitigations are unavailable.

If your data may have been exposed

Actively exploited remote-code-execution flaws are a common path into broader compromise and data theft, even when ransomware use is not documented for this CVE. If Langflow instances were exposed or you see signs of exploitation, follow your incident-response process: isolate affected hosts, preserve volatile evidence, rotate credentials and secrets that the service could access, and assess downstream systems the application could reach. As a quick personal check, you can run a free exposure scan of your email addresses against known breach datasets to see whether associated accounts appear in prior public dumps while you complete the full investigation.