CVE-2026-97678 Overview
CVE-2026-97678 is a remote code execution vulnerability affecting IBM Langflow OSS versions 1.0.0 through 1.12.2. The flaw stems from improper input validation [CWE-693: Protection Mechanism Failure], allowing a remote authenticated attacker to execute arbitrary code on the host running Langflow. Langflow is a visual framework for building multi-agent and retrieval-augmented generation (RAG) applications, often deployed as an internet-facing service to orchestrate large language model (LLM) workflows.
Critical Impact
An authenticated attacker can execute arbitrary code with the privileges of the Langflow process, leading to full compromise of confidentiality, integrity, and availability of the host.
Affected Products
- IBM Langflow OSS 1.0.0 through 1.12.2
Discovery Timeline
- 2026-10-07 - CVE-2026-97678 published to the National Vulnerability Database (NVD)
- 2026-10-07 - Last updated in NVD database
Technical Details for CVE-2026-97678
Vulnerability Analysis
Langflow exposes a browser-based builder and backing API that lets authenticated users compose, edit, and execute LLM pipelines. The vulnerable versions fail to adequately validate user-supplied input before it is passed into execution paths within the application. An authenticated attacker can craft input that bypasses the intended protection mechanism and reaches a code-execution sink. Because the attack originates over the network with low complexity and requires no user interaction, exploitation can be automated once valid credentials are obtained.
Successful exploitation grants arbitrary code execution in the context of the Langflow process. This typically means access to API keys, model credentials, vector store contents, and any data flowing through configured pipelines.
Root Cause
The root cause is improper input validation in IBM Langflow OSS releases 1.0.0 through 1.12.2. The protection mechanism intended to constrain untrusted input is insufficient, allowing attacker-controlled data to influence runtime behavior and reach code execution paths. Refer to the IBM Support Page for vendor-provided technical context.
Attack Vector
The attack vector is network-based and requires authentication. An attacker with any valid Langflow account submits crafted input through an exposed API endpoint or component configuration. The input evades validation and triggers execution of attacker-controlled logic within the Langflow runtime. No end-user interaction is required to complete the attack.
No verified public proof-of-concept is referenced in the advisory at publication time. See the IBM Support Page for authoritative details.
Stop Remote Code Execution Before It Runs
Singularity™ Endpoint detects and blocks exploit attempts at machine speed, including zero-days and novel attack techniques.
Stop Exploit AttemptsDetection Methods for CVE-2026-97678
Indicators of Compromise
- Unexpected child processes spawned by the Langflow Python runtime, such as sh, bash, python, or curl invocations originating from the Langflow service account.
- Outbound network connections from the Langflow host to unknown or non-allowlisted destinations, particularly shortly after authenticated API activity.
- New or modified flow definitions, custom components, or Python code blocks created by low-privilege accounts.
- Access to environment variables or credential files (.env, cloud metadata endpoints) by the Langflow process.
Detection Strategies
- Monitor authenticated requests to Langflow API routes that accept component definitions, custom code, or flow payloads and correlate them with subsequent process execution on the host.
- Alert on process lineage where the Langflow worker spawns interactive shells, scripting interpreters, or network utilities.
- Baseline normal Langflow outbound traffic patterns and flag deviations toward unexpected hosts or ports.
Monitoring Recommendations
- Enable verbose audit logging on the Langflow application and forward logs to a centralized analytics platform for correlation with endpoint telemetry.
- Track authentication events, including failed logins and new account creation, to detect credential compromise that precedes exploitation.
- Review file system changes under the Langflow working directory for new scripts, plugins, or configuration overrides.
How to Mitigate CVE-2026-97678
Immediate Actions Required
- Upgrade IBM Langflow OSS to a fixed release above 1.12.2 as published on the IBM Support Page.
- Restrict network exposure of Langflow instances to trusted administrative networks or place them behind authenticated reverse proxies with IP allowlisting.
- Rotate all credentials, API keys, and model provider tokens stored in or accessible to Langflow if exploitation is suspected.
- Audit existing user accounts and remove inactive, shared, or default credentials to reduce the authenticated attack surface.
Patch Information
IBM has published remediation guidance for CVE-2026-97678 on the IBM Support Page. Administrators should consult the advisory for the specific fixed version and upgrade procedure, then apply the update to all Langflow deployments running versions 1.0.0 through 1.12.2.
Workarounds
- Disable public access to the Langflow UI and API until the upgrade is applied, allowing only VPN or bastion-based administration.
- Enforce strong authentication and multi-factor authentication (MFA) on any identity provider fronting Langflow to reduce the risk of credential-based exploitation.
- Run Langflow as an unprivileged user inside a hardened container with read-only file systems and egress filtering to limit post-exploitation impact.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
