CVE-2026-24794
📋 TL;DR
This CVE describes a buffer overflow vulnerability in CardboardPowered's cardboard software, specifically in WorldImpl.java. Attackers could exploit this to execute arbitrary code or crash the server. This affects all users running cardboard versions before 1.21.4.
💻 Affected Systems
- CardboardPowered cardboard
⚠️ 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 server compromise, data theft, or ransomware deployment.
Likely Case
Server crashes causing denial of service and potential data corruption.
If Mitigated
Limited impact with proper network segmentation and minimal privileges.
🎯 Exploit Status
Buffer overflow vulnerabilities typically require some technical knowledge to exploit, but public details in the pull request could lower the barrier.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.21.4
Vendor Advisory: https://github.com/CardboardPowered/cardboard/pull/506
Restart Required: Yes
Instructions:
1. Stop the cardboard server. 2. Update to version 1.21.4 or later. 3. Restart the server.
🔧 Temporary Workarounds
Network isolation
linuxRestrict network access to the cardboard server to trusted IPs only
# Use firewall rules to restrict access
iptables -A INPUT -p tcp --dport 25565 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 25565 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the cardboard server
- Run the server with minimal privileges and in a containerized environment
🔍 How to Verify
Check if Vulnerable:
Check the cardboard version in server.properties or startup logsCheck Version:
grep 'cardboard' server.log | grep -i versionVerify Fix Applied:
Confirm version is 1.21.4 or later and monitor for crashes📡 Detection & Monitoring
Log Indicators:
- Unexpected server crashes
- Java stack traces mentioning WorldImpl
- Memory error messages
Network Indicators:
- Unusual connection patterns to port 25565
- Malformed Minecraft protocol packets
SIEM Query:
source="server.log" "WorldImpl" AND ("crash" OR "error" OR "exception")