Moderate Vulnerability in nginx: Data Injection via Man-in-the-Middle Attack on TLS Proxied Connections
Summary
ALSA-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 ↓
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, performance, and low memory usage. It is widely used for serving static content, load balancing, and as a reverse proxy. However, it is susceptible to security vulnerabilities that can compromise the integrity and confidentiality of data transmitted over TLS connections.
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 means that an attacker could intercept and manipulate the data being transmitted between the client and the server, potentially leading to unauthorized access to sensitive information or the injection of malicious content.
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 disabling TLS proxied connections until the update can be applied. This can be done by modifying the nginx configuration file to avoid using TLS for proxied connections.
Conclusion
The nginx vulnerability CVE-2026-1642 poses a significant risk through data injection via man-in-the-middle attacks on TLS connections. It is crucial to update to the patched version to safeguard against potential exploits. Users are encouraged to utilize tools like Vulert for real-time monitoring of vulnerabilities.
See every vulnerability recorded for nginx →
FAQ
CVE-2026-1642 is a security vulnerability in nginx that allows for data injection via a man-in-the-middle attack on TLS proxied connections.
You can check if your nginx installation is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor and alert for open-source vulnerabilities in your software.
The risks include unauthorized access to sensitive data, data manipulation, and potential exploitation of the server by attackers.
Yes, temporarily disabling TLS proxied connections can mitigate the risk until the update is applied.
If immediate updates are not possible, ensure that your network is secure and monitor for any suspicious activity while implementing the workaround.
Related vulnerabilities
Recent vulnerabilities recorded for nginx.
Follow Vulert in Google
Get more Vulert vulnerability and dependency-security updates in Google Search and AI results.