CVE-2026-42511: 21-Year-Old Remote Code Execution Vulnerability Discovered in FreeBSD

Aisle Security·medium signal

Security firm Aisle published a detailed breakdown of CVE-2026-42511, a remote code execution vulnerability that has existed in FreeBSD for 21 years. The discovery is connected to Anthropic's Project Glasswing, where Claude Mythos Preview autonomously identified and exploited the flaw without human involvement. The CVE underscores how AI-powered vulnerability scanning is finding bugs that two decades of human review missed.