Critical Security Update for qt6-qt5compat: Denial of Service Vulnerability
Summary
ALSA-2026:65816: Important: qt6-qt5compat security update. Affects qt6-qt5compat versions < 6.10.1-1.el10_2.1. Fixed in 6.10.1-1.el10_2.1. How to fix ↓
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Background
The qt6-qt5compat package provides compatibility libraries for applications built with Qt 6 that need to run on Qt 5. It allows developers to maintain functionality across different versions of the Qt framework, which is widely used for developing cross-platform applications. This package is crucial for ensuring that legacy applications can still function seamlessly while taking advantage of newer features in Qt 6.
Vulnerability Detail
The vulnerability identified as CVE-2026-9499 is a Denial of Service (DoS) issue caused by an out-of-bounds read in the text codec handling of the qt6-qt5compat package. This flaw can be exploited by attackers to crash applications that rely on this library, leading to service interruptions and potential data loss. The vulnerability arises from improper handling of input data, which can result in accessing memory locations outside the intended buffer.
How To Fix
Minimum fixed version
6.10.1-1.el10_2.1
This is the first release that contains the fix.
sudo dnf update qt6-qt5compatTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider temporarily disabling the affected applications that utilize qt6-qt5compat until the update can be applied. This will help mitigate the risk of exploitation while maintaining system integrity.
Conclusion
The qt6-qt5compat package has a critical vulnerability (CVE-2026-9499) that can lead to Denial of Service attacks. It is crucial to update to the latest patched version to ensure the security and stability of applications relying on this library. Users are encouraged to utilize tools like Vulert to monitor for vulnerabilities in their software.
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FAQ
CVE-2026-9499 is a security vulnerability in the qt6-qt5compat package that allows for Denial of Service attacks due to an out-of-bounds read in text codec handling.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which analyzes your manifest file for vulnerabilities.
Failure to address this vulnerability may lead to application crashes and potential service disruptions, impacting user experience and data integrity.
Yes, exploiting this vulnerability may lead to application crashes, which could result in data loss if not handled properly.
Vulert is a tool that monitors and alerts for open-source vulnerabilities in software using just a manifest file. It provides real-time insights without requiring code access or installation.
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