One post tagged with "NGINX ngx_http_rewrite_module"

Published on May 14, 2026

K000161019: NGINX ngx_http_rewrite_module vulnerability CVE-2026-42945 needs immediate review anywhere rewrite rules are doing request handling in front of applications, APIs, or login flows. If your stack depends on complex rewrite, if, return, or URI normalization behavior, this is the place to check first. The good news is that the issue is usually manageable with a clear audit, a temporary ruleset cleanup, and a controlled NGINX update.

For most operators, the practical question is not whether NGINX is present. It is whether ngx\_http\_rewrite\_module is used in a way that lets crafted requests bypass intended routing or security logic. That distinction matters. A plain static site with minimal config is a very different risk profile from a multi-tenant app gateway with legacy rewrite chains and a few heroic regexes written at 2 a.m.

The official link: https://my.f5.com/manage/s/article/K000161019