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CVE-2026-81032 — NebulaGraph exposes its runtime configuration over an unauthenticated HTTP service.

Key facts

CVE-2026-81032 is a Critical (9.8) vulnerability: NebulaGraph exposes its runtime configuration over an unauthenticated HTTP service.. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-81032
Severity Critical (9.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-81032/

Details

English | 한국어

Description

NebulaGraph exposes its runtime configuration over an unauthenticated HTTP service. Each daemon starts the web service defined in src/webservice/WebService.cpp, whose bind address defaults to all interfaces, and registers routes for reading and writing gflags alongside status and statistics. Neither the service nor its router carries any authentication, token check or address restriction. The read route returns the daemon's full set of runtime flag values, which includes the configured certificate, key and certificate-authority paths, the password file path, data directories and the transport-security enable flags. The write route parses a supplied map and applies each entry through the gflags runtime setter, so a caller able to reach the port can change the daemon's behaviour without restarting it, including disabling the transport-security flags, redirecting log files and altering flags such as failed_login_attempts and password_lock_time_in_secs. Public reports of this endpoint describe a single name, enable_authorize, being refused by the handler; at release 3.8.0 that refusal is not present and the handler applies every name it is given.

Vulnerability Details

Property Value
CVE ID CVE-2026-81032
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-81032/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2026-81032

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • https://github.com/vesoft-inc/nebula
  • https://github.com/vesoft-inc/nebula/blob/v3.8.0/src/webservice/SetFlagsHandler.cpp
  • https://github.com/vesoft-inc/nebula/blob/v3.8.0/src/webservice/WebService.cpp
  • https://github.com/vesoft-inc/nebula/issues/6157
  • https://www.vulncheck.com/advisories/nebulagraph-through-3.8.0-unauthenticated-read-and-modification-of-runtime-configuration
  • https://github.com/vesoft-inc/nebula/issues/6157

Generated by PoC Generator on 2026-08-30T19:09:32.852664965

Frequently asked questions

What is CVE-2026-81032?

CVE-2026-81032 is a Critical (9.8) vulnerability: NebulaGraph exposes its runtime configuration over an unauthenticated HTTP service.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-81032?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-81032?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.