CVE-2025-26866
📋 TL;DR
This CVE describes a remote code execution vulnerability in Apache HugeGraph's PD store where a malicious Raft node can exploit insecure Hessian deserialization. Attackers can execute arbitrary code on affected systems by injecting malicious objects during deserialization. Organizations running vulnerable versions of Apache HugeGraph with PD store enabled are affected.
💻 Affected Systems
- Apache HugeGraph
📦 What is this software?
Hugegraph by Apache
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary code, steal sensitive data, deploy ransomware, or pivot to other systems in the network.
Likely Case
Unauthorized remote code execution leading to data theft, service disruption, or deployment of cryptocurrency miners or backdoors.
If Mitigated
Limited impact due to network segmentation and restricted cluster access, potentially resulting in denial of service but not full compromise.
🎯 Exploit Status
Exploitation requires access to the Raft cluster and knowledge of Hessian deserialization vulnerabilities. The fix implements IP-based authentication and class whitelisting.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.7.0
Vendor Advisory: https://lists.apache.org/thread/ko8jkwbjbb99m45pg4sgo5xsm8gx9nsq
Restart Required: Yes
Instructions:
1. Backup configuration and data. 2. Download Apache HugeGraph version 1.7.0 or later. 3. Stop the HugeGraph service. 4. Replace the existing installation with the patched version. 5. Restart the HugeGraph service. 6. Verify the upgrade was successful.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to PD store and Raft cluster nodes using firewall rules to only allow trusted IP addresses.
iptables -A INPUT -p tcp --dport <pd_port> -s <trusted_ip> -j ACCEPT
iptables -A INPUT -p tcp --dport <pd_port> -j DROP
Disable PD Store
allIf PD store functionality is not required, disable it in the configuration to remove the attack surface.
Edit hugegraph.properties: set pd.store.enable=false
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the HugeGraph cluster from untrusted networks.
- Monitor for unusual deserialization activity and implement application-level firewalls to detect exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check the HugeGraph version and verify if PD store is enabled in the configuration file.Check Version:
grep 'version' hugegraph-release/conf/hugegraph.propertiesVerify Fix Applied:
Verify the installed version is 1.7.0 or later and confirm IP-based authentication is configured for Raft nodes.📡 Detection & Monitoring
Log Indicators:
- Unusual deserialization errors in PD store logs
- Unexpected Raft node connections from unauthorized IP addresses
- Java process spawning unexpected child processes
Network Indicators:
- Unusual network traffic to PD store ports from untrusted sources
- Suspicious serialized data patterns in network captures
SIEM Query:
source="hugegraph.logs" AND ("deserialization error" OR "unexpected class" OR "Raft connection from")