CVE-2026-1977
📋 TL;DR
This CVE describes a code injection vulnerability in the mcp-vegalite-server component that allows remote attackers to execute arbitrary code by manipulating the vegalite_specification parameter. The vulnerability affects all users of isaacwasserman mcp-vegalite-server up to commit 16aefed598b8cd897b78e99b907f6e2984572c61. Attackers can exploit this remotely without authentication.
💻 Affected Systems
- isaacwasserman/mcp-vegalite-server
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Remote code execution allowing attackers to run arbitrary commands on the vulnerable server, potentially stealing data or deploying malware.
If Mitigated
Limited impact if proper input validation and sandboxing are implemented, potentially only causing service disruption.
🎯 Exploit Status
Exploit has been publicly disclosed and the vulnerability is straightforward to exploit via code injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. The project maintainer has not responded to the vulnerability report. Consider alternative solutions or implement workarounds.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and sanitization for the vegalite_specification parameter before passing to eval function.
Implement code review to add input validation in visualize_data component
Disable or Remove Vulnerable Component
allTemporarily disable or remove the mcp-vegalite-server component until a fix is available.
Stop the mcp-vegalite-server service or remove it from your deployment
🧯 If You Can't Patch
- Network segmentation: Isolate the vulnerable server from critical systems and limit network access
- Implement strict firewall rules to limit inbound connections to the vulnerable service
🔍 How to Verify
Check if Vulnerable:
Check if your mcp-vegalite-server instance uses code from commit 16aefed598b8cd897b78e99b907f6e2984572c61 or earlierCheck Version:
git log --oneline -1 (if using git) or check deployment manifest for commit hashVerify Fix Applied:
Verify that input validation has been implemented for the vegalite_specification parameter in the visualize_data component📡 Detection & Monitoring
Log Indicators:
- Unusual eval function calls in visualize_data component
- Suspicious vegalite_specification parameters containing code-like patterns
Network Indicators:
- Unexpected outbound connections from the mcp-vegalite-server
- Unusual traffic patterns to/from the visualization service
SIEM Query:
source="mcp-vegalite-server" AND (message="eval" OR message="visualize_data") AND message CONTAINS suspicious_pattern