CVE-2026-0769
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary Python code on Langflow installations without authentication. Attackers can achieve full system compromise by exploiting improper input validation in the eval_custom_component_code function. All Langflow deployments using vulnerable versions are affected.
💻 Affected Systems
- Langflow
📦 What is this software?
Langflow by Langflow
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover, data exfiltration, lateral movement, and persistent backdoor installation
Likely Case
Remote code execution leading to application compromise, data theft, and potential ransomware deployment
If Mitigated
Attack blocked at perimeter, limited to isolated container if properly segmented
🎯 Exploit Status
ZDI has published advisory but no public exploit code yet. Attack requires sending crafted payload to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Langflow security advisory for specific version
Vendor Advisory: https://github.com/langflow-ai/langflow/security/advisories
Restart Required: Yes
Instructions:
1. Check Langflow GitHub security advisory for patch version
2. Update Langflow to patched version
3. Restart Langflow service
4. Verify fix by testing eval functionality
🔧 Temporary Workarounds
Disable custom components
allTemporarily disable eval_custom_component_code functionality
Modify Langflow configuration to disable custom component execution
Network segmentation
linuxRestrict access to Langflow instance
iptables -A INPUT -p tcp --dport [langflow_port] -s [trusted_ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [langflow_port] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit Langflow exposure
- Deploy WAF with RCE protection rules and input validation
🔍 How to Verify
Check if Vulnerable:
Check Langflow version against security advisory. Test if eval_custom_component_code accepts and executes untrusted input.Check Version:
Check Langflow package version or application about informationVerify Fix Applied:
Verify Langflow version is updated to patched version. Test that eval functionality properly sanitizes input.📡 Detection & Monitoring
Log Indicators:
- Unusual Python code execution in logs
- Suspicious eval function calls
- Unexpected process creation from Langflow
Network Indicators:
- Unusual outbound connections from Langflow host
- Traffic to known malicious IPs
SIEM Query:
source="langflow" AND (eval OR exec OR system) AND suspicious_payload