Moderate Security Update for nginx:1.24 - Data Injection Vulnerability
Summary
ALSA-2026:5581: Moderate: nginx:1.24 security update. Affects nginx versions < 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1. Fixed in 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.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 and low memory usage. It is widely used for serving static content, load balancing, and as a reverse proxy. The recent vulnerability affects nginx versions prior to 1.24.0-2.module_el8.10.0+4143+ec3e7d32, which could allow attackers to exploit TLS proxied connections.
Vulnerability Detail
The vulnerability, identified as CVE-2026-1642, allows for data injection via a man-in-the-middle attack on TLS proxied connections. This means that an attacker could intercept and manipulate data being transmitted between the client and server, potentially leading to unauthorized access or data breaches. The issue arises from improper validation of data in TLS connections, making it critical for users to address this vulnerability promptly.
How To Fix
Minimum fixed version
1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.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 measure, consider disabling TLS proxied connections until the update can be applied. This can be done by modifying your nginx configuration file to avoid using TLS for proxied connections, but this is not recommended for long-term use.
Conclusion
The nginx vulnerability CVE-2026-1642 poses a significant risk due to the potential for data injection via man-in-the-middle attacks on TLS proxied connections. It is crucial for users to update to the patched version to safeguard their applications. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2026-1642 is a vulnerability in nginx that allows for data injection via man-in-the-middle attacks on TLS proxied connections.
You can use Vulert, which monitors open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
Failing to update nginx could expose your application to data breaches and unauthorized access, as attackers could exploit the vulnerability to manipulate data in transit.
Yes, temporarily disabling TLS proxied connections can mitigate the risk, but it is not a long-term solution. Updating to the patched version is essential.
More details can be found on the CVE page for CVE-2026-1642, which includes information about the impact and acknowledgments.
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