Critical Security Update for nginx:1.24 - Heap Buffer Over-read and Memory Disclosure Vulnerabilities
Summary
ALSA-2026:59490: Important: nginx:1.24 security update. Affects nginx versions < 1:1.24.0-7.module_el9.8.0+298+469955e3.4.alma.1. Fixed in 1:1.24.0-7.module_el9.8.0+298+469955e3.4.alma.1. How to fix ↓
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Background
nginx is a high-performance web and proxy server that supports HTTP and other protocols, designed for high concurrency, performance, and low memory usage. It is widely used for serving web content and acting as a reverse proxy. However, recent vulnerabilities have been identified that could compromise its security and stability.
Vulnerability Detail
The vulnerabilities in nginx version 1.24 include a heap buffer over-read that allows for memory modification or denial of service (CVE-2026-56434) and a memory disclosure issue in the ngx_http_slice_module that can also lead to denial of service (CVE-2026-60005). These vulnerabilities can be exploited by attackers to manipulate server memory, potentially leading to unauthorized access or service interruptions.
How To Fix
Minimum fixed version
1:1.24.0-7.module_el9.8.0+298+469955e3.4.alma.1
This is the first release that contains the fix.
sudo dnf update nginxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you may consider disabling the ngx_http_slice_module if it is not critical for your application. This can be done by commenting out or removing the relevant configuration lines in your nginx configuration files.
Conclusion
The identified vulnerabilities in nginx version 1.24 pose significant risks that can lead to memory manipulation and denial of service. It is crucial to update to the patched version to ensure the security and stability of your web applications. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
The vulnerabilities can lead to memory modification, unauthorized access, and denial of service, affecting the stability and security of your web applications.
You can verify your nginx version by running 'nginx -v' in your terminal. If it is below the patched version, you should update it immediately.
Yes, you can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If an immediate update is not possible, consider disabling vulnerable modules or implementing strict access controls to mitigate risks.
Detailed information can be found on the CVE pages for CVE-2026-56434 and CVE-2026-60005, which provide insights into the vulnerabilities and their implications.
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