Critical NGINX Vulnerability Can Crash Workers and May Allow Remote Code Execution

**Advisory:** F5 has published emergency patches for CVE-2026-42533, a critical heap buffer overflow in NGINX that allows remote, unauthenticated attackers to crash worker processes and potentially achieve RCE; affected versions include nginx < 1.30.4 (stable), < 1.31.3 (mainline) and NGINX Plus < R37.0.3.1, and administrators are urged to upgrade to the listed patched releases, verify the version, restart NGINX, and apply temporary mitigations (rate-limiting, WAF, monitoring) if immediate patching is not possible.