CVE-2026-107350 — Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who…¶

Key facts

CVE-2026-107350 is a High (8.8) vulnerability: Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-107350
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-107350/

Details¶

English | 한국어

Description¶

Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user listed in auth_file to log in as any other user that authenticates using SCRAM, including PgBouncer admin users and backend superusers. A second StartupMessage sent during SCRAM authentication against a non-existent database is not rejected and switches the user being logged in as, while the SCRAM exchange is still verified against the keys of the first user.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-107350
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-107350/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-2026-107350

# 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://www.pgbouncer.org/changelog.html

Generated by PoC Generator on 2026-10-15T13:39:53.419537554

Frequently asked questions¶

What is CVE-2026-107350?¶

CVE-2026-107350 is a High (8.8) vulnerability: Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-107350?¶

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-2026-107350?¶

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.