CVE-2026-0768: Langflow Code Injection RCE Vulnerability

CVE-2026-0768 Overview

CVE-2026-0768 is a critical code injection vulnerability affecting Langflow that allows remote attackers to execute arbitrary code on affected installations without authentication. The specific flaw exists within the handling of the code parameter provided to the validate endpoint. The issue results from the lack of proper validation of a user-supplied string before using it to execute Python code. An attacker can leverage this vulnerability to execute code in the context of root.

Critical Impact

Unauthenticated remote code execution allows attackers to gain complete control over affected Langflow installations with root privileges.

Affected Products

• Langflow (all vulnerable versions)

Discovery Timeline

• 2026-01-23 - CVE-2026-0768 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-0768

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code - Code Injection). The flaw allows attackers to inject and execute arbitrary Python code through the validate endpoint without requiring any form of authentication.

The vulnerability is network-accessible with low attack complexity, requiring no privileges or user interaction to exploit. Successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected system, as code execution occurs with root-level privileges.

Root Cause

The root cause of this vulnerability is insufficient input validation on the code parameter within the validate endpoint. The application fails to properly sanitize or validate user-supplied strings before passing them to the Python interpreter for execution. This allows malicious actors to inject arbitrary Python code that the server will execute without restrictions.

Attack Vector

The attack is conducted remotely over the network by sending specially crafted requests to the validate endpoint. Since no authentication is required, any attacker with network access to the Langflow instance can exploit this vulnerability. The attacker supplies a malicious string via the code parameter, which is then executed as Python code with root privileges on the underlying server.

The vulnerability mechanism involves sending a crafted HTTP request to the /validate endpoint with a malicious code parameter. The server-side code processes this input without adequate sanitization and passes it directly to the Python execution environment. For detailed technical information, see the Zero Day Initiative Advisory ZDI-26-034.

Detection Methods for CVE-2026-0768

Indicators of Compromise

• Unusual HTTP requests targeting the /validate endpoint with suspicious code parameter values
• Unexpected Python processes spawned by the Langflow application
• Evidence of command execution or shell activity originating from the Langflow service
• Unauthorized file modifications or new files created with root ownership

Detection Strategies

• Monitor HTTP traffic for requests to the validate endpoint containing Python code patterns such as import os, subprocess, eval(), or exec()
• Implement Web Application Firewall (WAF) rules to detect and block code injection attempts in the code parameter
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process execution chains originating from Langflow

Monitoring Recommendations

• Enable verbose logging on the Langflow application to capture all requests to the validate endpoint
• Configure alerting for any unexpected outbound network connections from the Langflow server
• Monitor system logs for privilege escalation attempts or unusual root-level activity

How to Mitigate CVE-2026-0768

Immediate Actions Required

• Restrict network access to Langflow instances using firewall rules or network segmentation
• Implement authentication requirements for the validate endpoint if possible through reverse proxy configuration
• Consider temporarily disabling or restricting access to the validate endpoint until a patch is available
• Monitor systems for indicators of compromise as detailed above

Patch Information

Refer to the Zero Day Initiative Advisory ZDI-26-034 for the latest patch information and vendor guidance. Check the official Langflow release notes for security updates addressing this vulnerability.

Workarounds

• Deploy a reverse proxy or WAF in front of Langflow to filter and block requests containing potentially malicious code patterns in the code parameter
• Restrict network access to trusted IP addresses only until an official patch is available
• Run Langflow in an isolated container or virtual machine environment to limit the impact of potential exploitation
• Implement strict input validation at the network edge for requests targeting the validate endpoint

# Example: Restrict access to Langflow using iptables
# Allow only trusted IP addresses to access the service
iptables -A INPUT -p tcp --dport 7860 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 7860 -j DROP