GovCERT.HK's High Threat Security Alert (A26-05-36) confirms active exploitation of CVE-2026-42945, a denial-of-service and remote code execution vulnerability in Nginx, affecting stable versions prior to 1.30.1 and mainline prior to 1.31.0. The alert references six CVEs spanning memory safety, input validation, and configuration flaws, with potential impacts including full system compromise, service disruption, and data exfiltration. Given Nginx's pervasive role as a reverse proxy, load balancer, and ingress controller in enterprise, cloud, and containerized environments, the vulnerability presents a critical initial access vector for threat actors. Immediate patching is urged, with defenders advised to verify patch status across public-facing, internal, and cloud-deployed instances while monitoring for exploit indicators in logs and network traffic.
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