Critical Security Update for python3-tornado: Denial of Service Vulnerability
Summary
ALSA-2025:8136: Important: python-tornado security update. Affects python3-tornado versions < 6.4.2-2.el9_6.2. Fixed in 6.4.2-2.el9_6.2. How to fix ↓
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Background
Python3-tornado is an asynchronous web framework and networking library designed for building web applications. It is known for its high performance and ability to handle thousands of simultaneous connections. However, it has been found to be vulnerable to a Denial of Service (DoS) attack due to improper handling of multipart form-data, which can lead to service disruption.
Vulnerability Detail
The vulnerability identified as CVE-2025-47287 affects the tornado package, allowing attackers to exploit the multipart form-data processing. This can lead to a Denial of Service (DoS) condition, where the application becomes unresponsive due to excessive resource consumption. The issue arises from the way tornado handles multipart form-data, which can be manipulated by an attacker to overwhelm the server.
How To Fix
Minimum fixed version
6.4.2-2.el9_6.2
This is the first release that contains the fix.
sudo dnf update python3-tornadoTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate patching is not feasible, consider implementing rate limiting on your server 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.
Conclusion
The python3-tornado package has a critical vulnerability that can lead to Denial of Service attacks. It is crucial to update to the latest patched version to safeguard your application. Additionally, consider implementing workarounds such as rate limiting to mitigate risks until the update can be applied.
See every vulnerability recorded for python3-tornado →
FAQ
CVE-2025-47287 is a security vulnerability in the python3-tornado package that allows for Denial of Service attacks through multipart form-data.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability can lead to service disruptions, making your application unresponsive and affecting user experience.
Yes, implementing rate limiting on your server can help mitigate the risk of Denial of Service attacks until the patch is applied.
For more details, refer to the CVE page associated with CVE-2025-47287, which includes information on the impact and acknowledgments.
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