Die Verkettung von $uri$args in der nginx Konfigurationsdatei, vorhanden in Open Security Issue Management (OSIM) vor v2025.9.0, ermöglicht Path-Traversal-Angriffe über Query-Parameter.

The core of this vulnerability lies in the improper handling of $uri$args concatenation within the Nginx configuration file. An attacker can craft malicious query parameters that, when processed by Nginx, lead to the inclusion of files outside the intended directory. This could allow them to read sensitive configuration files, source code, or even execute arbitrary code if the server is misconfigured. The blast radius extends to any system running vulnerable Nginx instances, particularly those handling user-supplied input through query parameters. A successful exploit could lead to data breaches, system compromise, and denial of service.

Organizations running Nginx as a reverse proxy or load balancer, particularly those with custom configurations that utilize the $uri$args variable in file paths, are at increased risk. Shared hosting environments where multiple users share the same Nginx instance are also vulnerable, as an attacker could potentially exploit the vulnerability through another user's website.

• nginx / server:

# Check for vulnerable Nginx versions
nginx -v

• nginx / server:

# Review Nginx configuration files for usage of $uri$args in sensitive contexts (e.g., file paths)
grep -r '$uri$args' /etc/nginx/conf.d/* /etc/nginx/sites-enabled/*

• generic web:

# Attempt to access a restricted file via a crafted query parameter (e.g., ?file=../../../../etc/passwd)
curl 'http://your-nginx-server/index.html?file=../../../../etc/passwd'

1. 2026-01-29Disclosure

   disclosure

1. Reserviert2026-01-29
2. Veröffentlicht2026-01-29
3. Geändert2026-03-10
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2026-1616 is to upgrade to a version of Nginx newer than 2025.9.0, where the vulnerability has been addressed. If an immediate upgrade is not feasible, consider implementing temporary workarounds. These include carefully validating and sanitizing all user-supplied input within query parameters, restricting access to sensitive files through file system permissions, and employing a Web Application Firewall (WAF) to filter out malicious requests. Review your Nginx configuration files for any instances of $uri$args concatenation and ensure they are handled securely. After upgrading, confirm the fix by attempting to access files outside the intended directory via crafted query parameters; access should be denied.