Check Point Software has released security updates to address a critical vulnerability that can let attackers execute code with root privileges on management systems.
Tracked as CVE-2026-91843, this flaw stems from a stack-based buffer overflow weakness in the login process for Security Management Server instances, which manage Security Gateways (firewalls) and monitor network security events.
The security issue also affects the company's Log Server, a dedicated server that collects and stores logs generated by Check Point firewalls.
Successful exploitation lets threat actors without privileges gain root remote code execution in low-complexity attacks that don't require user interaction.
Check Point also provided temporary mitigation measures for customers who can't deploy the latest LivePatch, including hardening vulnerable systems against attacks and limiting access to trusted IP addresses/subnets by editing the entries under Manage & Settings > Permissions & Administrators > Trusted Clients in the SmartConsole dashboard.
While the company has not yet flagged this security flaw as actively exploited, it said security teams can identify CVE-2026-91843 attacks by looking for "Administrator failed to log in: Username too long" alerts in the Audit and Admin login logs.