# CVE-2025-26866: Apache HugeGraph-Server: RAFT and deserialization vulnerability

> A malicious Raft node can achieve remote code execution via insecure Hessian deserialization in Apache HugeGraph-Server.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Dec 2025
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-q37j-3367-fwv7

## What is CVE-2025-26866?

CVE-2025-26866 is a high-severity unsafe deserialization vulnerability in Apache HugeGraph-Server, published on 12 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-26866?

2 open source packages ship an affected version, including org.apache.hugegraph:hg-pd-core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.hugegraph:hg-pd-core` | Maven | All versions | 1.7.0 |
| `org.apache.hugegraph:hg-pd-core` | Maven | All versions | 1.7.0 |

Products: Apache Hugegraph.

## How do I fix CVE-2025-26866?

Upgrade org.apache.hugegraph:hg-pd-core to 1.7.0 or later.

## Is CVE-2025-26866 being exploited?

There is no known exploitation of CVE-2025-26866 in the wild and no public exploit code.

## Other vulnerabilities in Apache HugeGraph-Server

- [CVE-2024-27348](https://insights.sbomify.com/CVE-2024-27348/): Apache HugeGraph-Server Improper Access Control (critical 9.8, exploited in the wild)
- [CVE-2024-43441](https://insights.sbomify.com/CVE-2024-43441/): Apache HugeGraph-Server: Fixed JWT Token(Secret) (critical 9.8)
- [CVE-2024-27349](https://insights.sbomify.com/CVE-2024-27349/): Apache HugeGraph-Server: Bypass whitelist in Auth mode (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-26866 and fix it if it is affected.

What it is: CVE-2025-26866 is a high-severity unsafe deserialization vulnerability in Apache HugeGraph-Server, published on 12 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-26866 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.hugegraph:hg-pd-core (Maven): affected all versions; fixed in 1.7.0
- org.apache.hugegraph:hg-pd-core (Maven): affected all versions; fixed in 1.7.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-26866/ (Markdown: https://insights.sbomify.com/CVE-2025-26866/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-26866
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-26866
- OSV: https://osv.dev/vulnerability/CVE-2025-26866

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-26866/
Summaries are generated and may contain mistakes; the official description above is the record.