What is CVE-2025-26866?

CVE-2025-26866 is a high-severity vulnerability in Apache Hugegraph, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-12-12.

How severe is CVE-2025-26866?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in Apache Hugegraph

CVE-2025-26866

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 class: Insecure Deserialization

Published 2025-12-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000

Affected products

Apache Hugegraph
Apache Software Foundation Hugegraph-Server — versions 1.0.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

github.com/apache/incubator-hugegraph/pull/2735 (Patch, patch, Issue Tracking)
lists.apache.org/thread/ko8jkwbjbb99m45pg4sgo5xsm8gx9nsq (vendor-advisory, Mailing List)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)

Frequently asked questions

What is CVE-2025-26866?: CVE-2025-26866 is a high-severity vulnerability in Apache Hugegraph, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-12-12.
How severe is CVE-2025-26866?: High severity. CVSS v3 base score is 8.8 out of 10.