Critical Command-Line Option Injection Vulnerability in Python 3.11
Summary
ALSA-2026:6281: Important: python3.11 security update. Affects python3.11 versions < 3.11.13-6.el8_10. Fixed in 3.11.13-6.el8_10. How to fix ↓
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Background
Python 3.11 is an interpreted, interactive, object-oriented programming language that supports dynamic typing and high-level data types. It provides interfaces to various system calls and libraries, making it a versatile choice for developers. However, a recent security issue has been identified that affects its webbrowser module, potentially allowing attackers to exploit command-line options through crafted URLs.
Vulnerability Detail
The vulnerability arises from a command-line option injection in the webbrowser.open() function. This flaw allows an attacker to craft malicious URLs that, when executed, can lead to unintended command execution or exposure of sensitive information. The issue is tracked under CVE-2026-4519 and poses significant risks to applications relying on this functionality, as it can compromise the integrity and security of the system.
How To Fix
Minimum fixed version
3.11.13-6.el8_10
This is the first release that contains the fix.
sudo dnf update python3.11Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, avoid using the webbrowser.open() function with untrusted URLs. Validate and sanitize all input URLs before passing them to this function to mitigate potential risks until the package is updated.
Conclusion
In summary, the command-line option injection vulnerability in Python 3.11 poses significant security risks. Users are advised to update to the latest patched version to mitigate these risks. For those unable to update immediately, implementing input validation can serve as a temporary workaround.
See every vulnerability recorded for python3.11 →
FAQ
CVE-2026-4519 is a security vulnerability in Python 3.11 that allows command-line option injection through the webbrowser.open() function.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The risks include potential command execution and exposure of sensitive information, which can compromise system integrity.
Yes, the patched version is 3.11.13-6.el8_10. Updating to this version will resolve the vulnerability.
If immediate updating is not possible, avoid using the vulnerable function with untrusted URLs and validate all inputs.
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