F5 nginx vulnerability: Find impacted systems

A security advisory discloses CVE-2026-42945, a heap-based buffer overflow in NGINX's ngx_http_rewrite_module rated High (CVSS 8.1). Numerous NGINX and F5 product versions are affected; an unauthenticated remote attacker could trigger worker process restarts (DoS) and, in environments without ASLR, possibly achieve arbitrary code execution. The advisory provides fixed versions to upgrade to and a mitigation (use named capture groups in rewrite rules).