October 8, 2026 In December 2021, the discovery of the Log4Shell vulnerability (CVE-2021-44228) in the Apache Log4j library triggered one of the most disruptive cybersecurity incidents in history. What appeared to be a technical flaw in an open-source logging tool rapidly became a global security emergency, forcing organizations to rethink not just software security—but the economics of risk itself. Log4j’s vulnerability was remarkable not just because of its severity, but because of its reach.