Moderate Vulnerability in nginx: Data Injection via Man-in-the-Middle Attack on TLS Proxied Connections
Summary
RLSA-2026:4705: Moderate: nginx security update. Affects nginx versions < 2:1.26.3-2.el10_1. Fixed in 2:1.26.3-2.el10_1. How to fix ↓
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Background
nginx is a widely-used web and proxy server known for its high concurrency, performance, and low memory usage. It supports various protocols, including HTTP, and is often employed to serve static content, reverse proxy, and load balancing. The recent vulnerability poses a risk to the integrity of data transmitted over TLS proxied connections, potentially allowing attackers to inject malicious data.
Vulnerability Detail
The vulnerability identified as CVE-2026-1642 allows for data injection through a man-in-the-middle attack on TLS proxied connections. This issue arises when an attacker intercepts the communication between the client and the server, enabling them to manipulate the data being transmitted. The ramifications of this vulnerability include unauthorized data modification, which could lead to further exploitation or data breaches, affecting the confidentiality and integrity of the information exchanged.
How To Fix
Minimum fixed version
2:1.26.3-2.el10_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, consider implementing additional security measures such as using VPNs or secure tunnels for sensitive data transmission. However, these measures do not replace the need for updating the package.
Conclusion
The nginx vulnerability CVE-2026-1642 poses a moderate risk due to the potential for data injection via man-in-the-middle attacks on TLS proxied connections. It is crucial to update to the latest patched version to safeguard against this issue.
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FAQ
CVE-2026-1642 is a vulnerability in nginx that allows for data injection via a man-in-the-middle attack on TLS proxied connections.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
The potential impacts include unauthorized data modification and the risk of data breaches, compromising the integrity and confidentiality of transmitted information.
You can update nginx by running the command 'sudo yum update nginx' in your terminal, ensuring you are on version 2:1.26.3-2.el10_1 or later.
Vulert is a tool that monitors and alerts in real-time for open-source vulnerabilities in software using just a manifest file like package-lock.json.
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