DEEP#DOOR Python Backdoor Framework

The DEEP#DOOR Python backdoor framework, uncovered in May 2026, provides attackers with persistent system access and credential harvesting, threatening organizations that run untrusted Python code. Analysis reveals it can exfiltrate 200+ credential types per compromised host, making it 60% more aggressive than the average Python backdoor. Though it demands prior access unlike #1 CVE-2026-31431, its ability to pivot across environments—often within 12 hours—makes it a supply chain hazard ranking higher than #3 Lightning's single-package compromise in terms of lateral spread.