D6fault is an American security researcher known for identifying and responsibly disclosing cybersecurity vulnerabilities in government and corporate systems. Born in the United States, he began studying computer security at the age of 11 and developed a strong interest in ethical hacking and network defense.

At age 13, he began his practical training on TryHackMe, where he has completed over 300+ rooms, developing hands-on expertise across penetration testing, network analysis, and web application security. By the age of 14, D6fault had reported several security issues affecting U.S. government entities, including the Department of Defense, Department of Education, United States Air Force (USAF), and the Department of Health and Human Services (HHS).

His work focuses on vulnerability discovery, ethical disclosure, and improving system security through responsible reporting and educational content creation.