CVE-2026-97679: IBM Langflow OSS RCE Vulnerability

CVE-2026-97679 Overview

CVE-2026-97679 is a code injection vulnerability affecting IBM Langflow OSS versions 1.0.0 through 1.12.2. The flaw stems from improper neutralization of special elements used in operating system commands, categorized under [CWE-94]. A remote authenticated attacker can exploit this weakness to execute arbitrary code on the underlying host. The vulnerability requires low privileges and no user interaction, making it exploitable by any authenticated user with network access to the Langflow instance. IBM has published a security advisory addressing the issue.

Critical Impact

Authenticated remote attackers can execute arbitrary OS commands on affected Langflow deployments, leading to full compromise of confidentiality, integrity, and availability.

Affected Products

• IBM Langflow OSS 1.0.0
• IBM Langflow OSS versions 1.0.0 through 1.12.2
• IBM Langflow OSS 1.12.2

Discovery Timeline

• 2026-10-07 - CVE CVE-2026-97679 published to NVD
• 2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-97679

Vulnerability Analysis

IBM Langflow OSS is an open-source framework for building language model applications through a visual flow editor. The vulnerability resides in how the application handles user-supplied input that is passed into OS command execution contexts. Insufficient input validation allows an authenticated attacker to inject special shell metacharacters or command sequences into parameters that are subsequently used in system calls.

Because Langflow executes workflows and code components on the server, inputs that reach command execution APIs without proper sanitization become a vector for arbitrary code execution. Successful exploitation runs commands with the privileges of the Langflow process, which typically has access to API keys, model artifacts, and connected data sources.

Root Cause

The root cause is improper neutralization of special elements in OS commands, classified under [CWE-94] (Improper Control of Generation of Code). Langflow fails to validate or escape attacker-controlled strings before incorporating them into command strings or interpreter contexts. This design permits injected payloads to break out of the intended data boundary and execute as code.

Attack Vector

Exploitation requires network access to a Langflow deployment and valid authentication credentials. An attacker submits crafted input through an API endpoint or workflow component that reaches the vulnerable code path. The injected payload executes in the context of the Langflow service, enabling command execution, data exfiltration, or lateral movement into connected systems.

No verified public proof-of-concept exploit is available at the time of publication. See the IBM Security Advisory for vendor-provided technical details.

Detection Methods for CVE-2026-97679

Indicators of Compromise

• Unexpected child processes spawned by the Langflow service account, including shells (/bin/sh, /bin/bash) or interpreters (python, curl, wget).
• Outbound network connections from Langflow hosts to unfamiliar external IP addresses or domains.
• Modifications to Langflow configuration files, flow definitions, or custom component code outside of normal change windows.

Detection Strategies

• Monitor process execution telemetry on hosts running Langflow for anomalous command invocations originating from the application process tree.
• Inspect HTTP request logs for payloads containing shell metacharacters (;, |, &&, backticks, $()) submitted to Langflow API endpoints.
• Correlate authentication events with subsequent command execution to identify compromised accounts abusing the flaw.

Monitoring Recommendations

• Enable verbose audit logging on Langflow instances and forward logs to a centralized SIEM for behavioral analysis.
• Baseline normal Langflow process behavior and alert on deviations such as new outbound connections or privilege changes.
• Track access patterns to administrative or flow-execution endpoints and flag spikes from single accounts or IP addresses.

How to Mitigate CVE-2026-97679

Immediate Actions Required

• Upgrade IBM Langflow OSS to a version beyond 1.12.2 as directed in the IBM Security Advisory.
• Restrict network access to Langflow management and API endpoints using firewalls, VPNs, or reverse proxy authentication.
• Audit existing Langflow user accounts and revoke credentials that are no longer required or appear suspicious.

Patch Information

IBM has released a security advisory for CVE-2026-97679. Administrators should consult the IBM Security Advisory for the fixed version and upgrade instructions applicable to their deployment.

Workarounds

• Enforce strong authentication and multi-factor authentication for all Langflow users to limit the pool of potential attackers.
• Run the Langflow service under a dedicated, least-privilege account and isolate it using containers or sandboxing to limit blast radius.
• Disable or restrict custom component execution and code-execution features for users who do not require them.

# Configuration example
# Restrict Langflow to listen only on localhost behind an authenticated reverse proxy
export LANGFLOW_HOST=127.0.0.1
export LANGFLOW_PORT=7860

# Run Langflow as a non-privileged user inside a container
docker run --rm \
  --user 1000:1000 \
  --read-only \
  --cap-drop=ALL \
  -p 127.0.0.1:7860:7860 \
  langflowai/langflow:latest