OPEN FORMAL SECURITY ADVISORY
Critical Vulnerabilities Render Certified U.S. Election Systems Insecure Issued By: Mark CookCybersecurity Professional, 40+ Years ExperienceDate: May 13, 2026 I am issuing this formal security advisory to notify all state election officials, the U.S. Election Assistance Commission, federal agencies, and the American public that multiple certified voting systems currently in use across the United States are critically vulnerable to publicly available exploits. A single independent security researcher operating under the name Nightmare-Eclipse has publicly released four powerful exploits: RedSun, BlueHammer, UnDefend, and YellowKey. These exploits target multiple critical components of the Windows operating system. Detailed Breakdown of the Exploits: The fact that these severe vulnerabilities were only recently discovered does not mean they have not been exploited for years. Zero-day vulnerabilities of this nature can remain undetected for long