Critical Remote Code Execution Vulnerability in python3-urwid Package
Summary
ALSA-2026:58561: Important: python-urwid security update. Affects python3-urwid versions < 2.5.3-4.el10_2.5. Fixed in 2.5.3-4.el10_2.5. How to fix ↓
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Background
Python3-urwid is a library for creating user interfaces in Python. It provides a set of widgets and tools for building console applications with rich user interfaces. The library is widely used due to its flexibility and ease of use, allowing developers to create interactive applications. However, a recent vulnerability has been identified that compromises the security of applications using this library.
Vulnerability Detail
The vulnerability arises from predictable session IDs in the urwid library, which can be exploited by an attacker to execute arbitrary code remotely or disclose sensitive information. This issue, identified as CVE-2026-9323, poses a significant risk as it allows unauthorized access to the application's session management, potentially leading to severe security breaches.
How To Fix
Minimum fixed version
2.5.3-4.el10_2.5
This is the first release that contains the fix.
sudo dnf update python3-urwidTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider implementing additional session management controls, such as using more complex session ID generation algorithms or restricting access to sensitive operations until the package can be updated.
Conclusion
The python3-urwid package has a critical vulnerability that can lead to remote code execution due to predictable session IDs. It is essential to update to the latest patched version to secure your applications. Additionally, utilizing tools like Vulert can help monitor and alert for open-source vulnerabilities in real-time.
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FAQ
CVE-2026-9323 is a security vulnerability in the python3-urwid package that allows for remote code execution due to predictable session IDs.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Not fixing this vulnerability could lead to unauthorized access, data breaches, and potential exploitation of your application by malicious actors.
Yes, implementing additional session management controls can help mitigate the risk until the package is updated.
More information can be found on the CVE page associated with CVE-2026-9323, which details the impact and technical aspects of the vulnerability.
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