Critical Security Update for python-tornado: Denial of Service Vulnerability
Summary
RLSA-2025:8135: Important: python-tornado security update. Affects python-tornado versions < 0:6.4.2-1.el10_0.1. Fixed in 0:6.4.2-1.el10_0.1. How to fix ↓
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Background
Python-tornado is an asynchronous web framework and networking library for Python, designed to handle thousands of simultaneous connections efficiently. It is widely used for building web applications and services that require long-lived network connections. This package is known for its high performance and scalability, making it a popular choice among developers. However, it has recently been identified as vulnerable to a Denial of Service (DoS) attack, which can severely impact the availability of applications built using this framework.
Vulnerability Detail
The vulnerability, identified as CVE-2025-47287, allows an attacker to exploit the Tornado Multipart Form-Data handling, leading to a Denial of Service condition. This can occur when the application is processing multipart form data, potentially causing it to become unresponsive. The vulnerability has a CVSS score of 7.5, indicating a high severity level. If exploited, it could lead to significant downtime and service disruption for users relying on affected applications.
How To Fix
Minimum fixed version
0:6.4.2-1.el10_0.1
This is the first release that contains the fix.
sudo dnf update python-tornadoTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, you can implement rate limiting on your application to mitigate the impact of potential DoS attacks. This can be done by configuring your web server or application to limit the number of requests from a single IP address within a specified timeframe.
Conclusion
The python-tornado package has a critical vulnerability that can lead to Denial of Service attacks. It is crucial for users and developers to update to the latest patched version to ensure the security and availability of their applications. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2025-47287 is a vulnerability in the python-tornado package that allows for Denial of Service attacks through improper handling of multipart form data.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to application downtime and service disruption, affecting user access and experience.
Yes, a patched version of python-tornado is available. Updating to version 0:6.4.2-1.el10_0.1 will resolve the issue.
Vulert is a service that monitors and alerts for open-source vulnerabilities in software using just a manifest file like package-lock.json, providing real-time insights.
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