CVE-2025-3248
📋 TL;DR
CVE-2025-3248 is an unauthenticated remote code execution vulnerability in Langflow's /api/v1/validate/code endpoint. Attackers can send crafted HTTP requests to execute arbitrary code on vulnerable systems. All Langflow instances running versions before 1.3.0 are affected.
💻 Affected Systems
- Langflow
📦 What is this software?
Langflow by Langflow
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal data, deploy ransomware, pivot to other systems, and establish persistent backdoors.
Likely Case
Data theft, cryptocurrency mining, lateral movement within the network, and installation of persistence mechanisms.
If Mitigated
Limited impact if proper network segmentation, egress filtering, and monitoring are in place, though initial compromise would still occur.
🎯 Exploit Status
Multiple public exploit scripts and detailed technical analysis are available. CISA has added this to their Known Exploited Vulnerabilities catalog.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.0
Vendor Advisory: https://github.com/langflow-ai/langflow/releases/tag/1.3.0
Restart Required: Yes
Instructions:
1. Backup your Langflow configuration and data. 2. Stop the Langflow service. 3. Update to version 1.3.0 using pip: 'pip install langflow==1.3.0'. 4. Restart the Langflow service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Control
allRestrict access to the vulnerable endpoint using network controls
Authentication Enforcement
allImplement authentication before the vulnerable endpoint if upgrading isn't immediately possible
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Langflow instances
- Deploy web application firewall rules to block malicious requests to /api/v1/validate/code
🔍 How to Verify
Check if Vulnerable:
Check Langflow version. If version is below 1.3.0, the system is vulnerable. Also check if /api/v1/validate/code endpoint is accessible without authentication.Check Version:
python -c "import langflow; print(langflow.__version__)"Verify Fix Applied:
Verify Langflow version is 1.3.0 or higher and test that the /api/v1/validate/code endpoint properly validates and sanitizes input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /api/v1/validate/code
- Suspicious command execution patterns in system logs
- Unexpected process creation from Langflow
Network Indicators:
- HTTP requests to /api/v1/validate/code containing Python code or system commands
- Outbound connections from Langflow to unexpected destinations
SIEM Query:
source="langflow" AND (url="/api/v1/validate/code" OR process="python" AND cmdline="exec" OR cmdline="eval")🔗 References
- https://github.com/langflow-ai/langflow/pull/6911
- https://github.com/langflow-ai/langflow/releases/tag/1.3.0
- https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/
- https://www.vulncheck.com/advisories/langflow-unauthenticated-rce
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3248
