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CVE-2026-80104 — DB-GPT builds the destination path for an uploaded skill from the multipart filename…

Key facts

CVE-2026-80104 is a Critical (9.8) vulnerability: DB-GPT builds the destination path for an uploaded skill from the multipart filename…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-80104
Severity Critical (9.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-80104/

Details

English | 한국어

Description

DB-GPT builds the destination path for an uploaded skill from the multipart filename without constraining it to the upload directory. skill_upload in packages/dbgpt-app/src/dbgpt_app/openapi/api_v1/agentic_data_api.py takes file.filename as given and writes the request body to upload_dir / filename. A path composed with that operator discards the left operand when the right one is absolute and follows parent references otherwise, so a filename such as ../../../tmp/x or /tmp/x resolves outside the intended directory; nothing canonicalises the result, checks that it remains under the upload root, or prevents a .py suffix. The route's only dependency is get_user_from_headers in dbgpt_serve/utils/auth.py, which returns a request carrying the admin role whether or not a user_id header is supplied, so the endpoint is reachable without credentials. A remote attacker holding no account can therefore write attacker-controlled bytes to any path the server process can write, place a new Python module inside the application package or replace one the application already imports, and obtain code execution in the server process when that module is next imported.

Vulnerability Details

Property Value
CVE ID CVE-2026-80104
Type PATH_TRAVERSAL
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-80104/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-2026-80104

# 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/eosphoros-ai/DB-GPT
  • https://github.com/eosphoros-ai/DB-GPT/blob/v0.8.0/packages/dbgpt-app/src/dbgpt_app/openapi/api_v1/agentic_data_api.py
  • https://github.com/eosphoros-ai/DB-GPT/releases/tag/v0.8.1
  • https://pypi.org/project/dbgpt-app/
  • https://www.vulncheck.com/advisories/db-gpt-0.8.0-path-traversal-arbitrary-file-write-via-skill-upload-filename

Generated by PoC Generator on 2026-08-26T08:11:20.920287397

Frequently asked questions

What is CVE-2026-80104?

CVE-2026-80104 is a Critical (9.8) vulnerability: DB-GPT builds the destination path for an uploaded skill from the multipart filename…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-80104?

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-2026-80104?

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.