CVE-2026-22219
📋 TL;DR
This CVE describes a server-side request forgery (SSRF) vulnerability in Chainlit versions before 2.9.4 when using the SQLAlchemy data layer backend. An authenticated attacker can inject a malicious URL into an Element, causing the server to make arbitrary HTTP GET requests to internal or cloud services and store the responses. This affects users of vulnerable Chainlit deployments with the SQLAlchemy backend enabled.
💻 Affected Systems
- Chainlit
📦 What is this software?
Chainlit by Chainlit
⚠️ Risk & Real-World Impact
Worst Case
An attacker could access sensitive internal network services, cloud metadata endpoints (potentially leading to cloud takeover), and exfiltrate data via stored responses, resulting in full compromise of internal infrastructure or cloud resources.
Likely Case
Attackers with authenticated access could probe internal networks, retrieve metadata from cloud providers (e.g., AWS IMDS), and potentially access other internal web services, leading to data exposure and lateral movement.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated segments, but data exfiltration via storage may still occur if the vulnerability is exploited.
🎯 Exploit Status
Exploitation requires authenticated access to the Chainlit interface, but the SSRF mechanism is straightforward once access is gained. Public details suggest it could be easily weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.9.4
Vendor Advisory: https://github.com/Chainlit/chainlit/releases/tag/2.9.4
Restart Required: Yes
Instructions:
1. Update Chainlit to version 2.9.4 or later using pip: 'pip install --upgrade chainlit==2.9.4'. 2. Restart the Chainlit server to apply the patch. 3. Verify the update by checking the version.
🔧 Temporary Workarounds
Disable SQLAlchemy Backend
allSwitch to a non-vulnerable data layer backend if possible, such as the default in-memory backend, to mitigate the SSRF vulnerability.
Modify Chainlit configuration to use a different backend, e.g., set data_layer to 'memory' in config files.
Network Segmentation
linuxRestrict outbound HTTP requests from the Chainlit server to only necessary external services using firewall rules or network policies.
Configure firewall (e.g., iptables on Linux) to block outbound HTTP/HTTPS from Chainlit server except to allowed destinations.
🧯 If You Can't Patch
- Implement strict authentication and authorization controls to limit access to authenticated users who need to create or update Elements.
- Monitor and log all outbound HTTP requests from the Chainlit server for suspicious activity, such as requests to internal IPs or cloud metadata endpoints.
🔍 How to Verify
Check if Vulnerable:
Check if Chainlit version is below 2.9.4 and if the SQLAlchemy data layer backend is configured in the deployment settings.Check Version:
Run 'chainlit --version' or check the Python package with 'pip show chainlit' to see the installed version.Verify Fix Applied:
After updating, confirm the version is 2.9.4 or higher and test that providing a malicious URL in an Element no longer triggers outbound HTTP requests.📡 Detection & Monitoring
Log Indicators:
- Log entries showing HTTP GET requests initiated by the Chainlit server to unusual internal or cloud metadata URLs, especially from element update operations.
Network Indicators:
- Outbound HTTP traffic from the Chainlit server to internal network ranges (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) or cloud metadata endpoints (e.g., 169.254.169.254 for AWS).
SIEM Query:
Example query for SIEM: 'source="chainlit.log" AND (url CONTAINS "169.254.169.254" OR url CONTAINS "10." OR url CONTAINS "192.168.")'