CRITICAL: 18-Year-Old NGINX Rewrite Module Flaw Hits Active Exploitation in Days
A heap buffer overflow lurking in NGINX's ngx_http_rewrite_module since 2008 went from coordinated disclosure to active in-the-wild exploitation in roughly seventy-two hours. CVE-2026-42945 affects every release from 0.6.27 through 1.30.0 across both Open Source and Plus, can crash worker processes trivially, and can reach remote code execution on hosts where ASLR is disabled. Patches are available in NGINX 1.30.1 and 1.31.0.