https://seclists.org/oss-sec/2026/q2/645: Host ambiguous quests through NGINX $host and Debian's proxy_params
Published May 21, 2026
·Updated
Affected Software
2 affected components
Nginx nginx
debian/nginx<1.26.3-3+deb13u4
Frequently Asked Questions
1
What is the severity of CVE-2026-XXXX?
The severity of CVE-2026-XXXX has been categorized as high due to potential security implications.
2
How do I fix CVE-2026-XXXX?
To fix CVE-2026-XXXX, ensure that your NGINX configuration is strictly validating the Host header.
3
Who is affected by CVE-2026-XXXX?
CVE-2026-XXXX affects users of NGINX configured with Debian's proxy_params that do not properly validate $http_host.
4
What types of attacks can be executed with CVE-2026-XXXX?
An attacker can exploit CVE-2026-XXXX to bypass security restrictions and potentially redirect traffic or perform unauthorized actions.
5
Is upgrading NGINX sufficient to mitigate CVE-2026-XXXX?
Upgrading NGINX may help mitigate CVE-2026-XXXX, but proper configuration adjustments are also necessary to fully remediate the issue.