Critical nginx Security Update: Heap Buffer Over-read and Memory Disclosure Vulnerabilities
Summary
ALSA-2026:59220: Important: nginx security update. Affects nginx versions < 2:1.26.3-6.el10_2.6. Fixed in 2:1.26.3-6.el10_2.6. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
nginx is a high-performance web and proxy server that supports HTTP and other protocols, designed for high concurrency and low memory usage. It is widely used for serving static content, load balancing, and as a reverse proxy. However, recent vulnerabilities have been identified that could compromise the security of systems running nginx, particularly affecting versions prior to 2:1.26.3-6.el10_2.6.
Vulnerability Detail
The vulnerabilities in nginx include a heap buffer over-read that allows for memory modification or denial of service (CVE-2026-56434) and memory disclosure leading to denial of service in the ngx_http_slice_module (CVE-2026-60005). These vulnerabilities could allow attackers to exploit the server's memory, potentially leading to unauthorized access or service interruptions.
How To Fix
Minimum fixed version
2:1.26.3-6.el10_2.6
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 measure, consider disabling the affected modules or restricting access to the nginx server until the update can be applied. This may involve modifying the nginx configuration files to limit exposure to potential attacks.
Conclusion
The identified vulnerabilities in nginx pose significant risks to server security and performance. It is crucial for users to update to the latest patched version to mitigate these risks. Regular monitoring and timely updates are essential for maintaining a secure environment.
See every vulnerability recorded for nginx →
FAQ
The vulnerabilities can lead to memory modification, denial of service, and potential unauthorized access to sensitive data.
You can check your nginx version by running 'nginx -v' in the terminal. If it is below 2:1.26.3-6.el10_2.6, it is vulnerable.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time using just a manifest file like package-lock.json.
If an immediate update is not possible, consider implementing temporary workarounds such as disabling affected modules or restricting server access.
For detailed information, refer to the CVE pages for CVE-2026-56434 and CVE-2026-60005.
Related vulnerabilities
Recent vulnerabilities recorded for nginx.
