https://seclists.org/oss-sec/2026/q2/656: Host ambiguous quests through NGINX **$http_host** and Debian's proxy_params
Published May 21, 2026
·Updated
Affected Software
2 affected components
Nginx nginx
debian/nginx
Frequently Asked Questions
1
What is the severity of CVE-2026-XXXX?
The severity of CVE-2026-XXXX is currently assessed as high due to potential security implications.
2
How do I fix CVE-2026-XXXX?
To fix CVE-2026-XXXX, ensure you are running the latest version of NGINX and review the proxy_params to mitigate ambiguous request handling.
3
What systems are affected by CVE-2026-XXXX?
CVE-2026-XXXX affects NGINX when deployed with Debian's default proxy_params configuration.
4
Is CVE-2026-XXXX being actively exploited?
As of now, there are no reported active exploits for CVE-2026-XXXX, but users should remain vigilant.
5
What configurations should I review for CVE-2026-XXXX?
You should review the NGINX proxy_params configuration and any custom settings related to $http_host.