cve 2026 91843

CVE-2026-91843 is a critical Check Point vulnerability covered on WindowsForum.com, where administrators running self-managed Security Management Server or Log Server deployments are urged to apply the vendor's LivePatch immediately. Disclosed September 16, the flaw is a CVSS 9.8 stack-based buffer overflow in the unauthenticated login process that can allow a remote attacker to execute arbitrary code as root, the highest privilege level on the appliance. No credentials or user interaction are required, making rapid patching essential. The discussion draws on Check Point's CheckMates advisory, BleepingComputer reporting, and an independent NHS England cyber alert listing affected Security Management and Multi-Domain deployments.