A critical vulnerability, CVE-2026-42945, in NGINX Open Source and NGINX Plus versions 0.6.27 to 1.30.0 has been exploited by hackers. This flaw can cause worker process crashes and enable remote code execution (RCE) if ASLR protection is disabled. Ledger CTO Charles Guillemet noted that less than 30% of servers are likely running the latest NGINX version, with the vulnerability spreading faster than IT teams can patch and upgrade systems.