CVE-2026-0755
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on systems running vulnerable versions of gemini-mcp-tool without authentication. The flaw exists in the execAsync method where user input is not properly sanitized before being passed to system calls. Any system running the affected software with network exposure is at risk.
💻 Affected Systems
- gemini-mcp-tool
⚠️ 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
Complete system compromise with attacker gaining full control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, exfiltrate sensitive data, or use the system as a pivot point for further attacks.
If Mitigated
Limited impact if proper network segmentation, least privilege principles, and input validation are implemented, though the vulnerability still presents significant risk.
🎯 Exploit Status
The vulnerability is straightforward to exploit due to lack of authentication requirements and simple command injection vector.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-26-021/
Restart Required: Yes
Instructions:
1. Check current gemini-mcp-tool version
2. Download and apply the latest patched version from official source
3. Restart the gemini-mcp-tool service
4. Verify the patch is applied successfully
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to gemini-mcp-tool to only trusted IP addresses or internal networks
# Example firewall rule (Linux): iptables -A INPUT -p tcp --dport [gemini-port] -s [trusted-ip] -j ACCEPT
# Example firewall rule (Windows): New-NetFirewallRule -DisplayName "Block Gemini External" -Direction Inbound -Protocol TCP -LocalPort [gemini-port] -RemoteAddress NotLocalSubnet -Action Block
Service Account Privilege Reduction
linuxRun gemini-mcp-tool with minimal necessary privileges to limit potential damage
# Linux: sudo useradd -r -s /bin/false gemini-user
# Linux: sudo chown -R gemini-user:gemini-user /path/to/gemini
# Linux: sudo systemctl edit gemini.service (set User=gemini-user)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy application-level firewall or WAF with command injection detection rules
🔍 How to Verify
Check if Vulnerable:
Check if gemini-mcp-tool is running and accessible on the network, then verify version against patched releaseCheck Version:
# Check gemini-mcp-tool version: gemini-mcp-tool --version or check package managerVerify Fix Applied:
Test that command injection attempts no longer succeed and verify running version matches patched release📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Unexpected process creation from gemini-mcp-tool service account
- Failed authentication attempts followed by successful command execution
Network Indicators:
- Unusual outbound connections from gemini-mcp-tool host
- Suspicious payloads in requests to gemini-mcp-tool endpoints
- Traffic patterns indicating command and control communication
SIEM Query:
source="gemini-logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")