CVE-2026-41920 — Improper Access Control vulnerability in Apache Traffic Server.¶

Key facts

CVE-2026-41920 is a Critical (9.3) vulnerability: Improper Access Control vulnerability in Apache Traffic Server.. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-41920
Severity	Critical (9.3)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-41920/

Details¶

English | 한국어

Description¶

Improper Access Control vulnerability in Apache Traffic Server.

This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3.

Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-41920
CVSS Score	9.3

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-41920/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-2026-41920

# 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://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d

Generated by PoC Generator on 2026-08-03T02:40:45.415342018

Frequently asked questions¶

What is CVE-2026-41920?¶

CVE-2026-41920 is a Critical (9.3) vulnerability: Improper Access Control vulnerability in Apache Traffic Server.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-41920?¶

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-2026-41920?¶

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.