RCE in TiDB PD via Hessian deserialization before 1.7
CVE-2025-26866 Published on December 12, 2025
Apache HugeGraph-Server: RAFT and deserialization vulnerability
A remote code execution vulnerability exists where a malicious Raft node can exploit insecure Hessian deserialization within the PD store. The fix enforces IP-based authentication to restrict cluster membership and implements a strict class whitelist to harden the Hessian serialization process against object injection attacks.
Users are recommended to upgrade to version 1.7.0, which fixes the issue.
Vulnerability Analysis
CVE-2025-26866 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2025-26866 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2025-26866
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Affected Versions
Apache Software Foundation Apache HugeGraph-Server:- Version 1.0.0 and below 1.7.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.