Black October

In October 2026, Bitcoin fell by 7.3% after a decline of about 4% the previous year. Two consecutive October losses have prompted analysts to reassess seasonal signals: historically, October has delivered the highest median returns, but institutional flows are changing the landscape.

In recent weeks, AI developers, government agencies, and companies reported a series of incidents. CISA mandated U.S. federal civilian agencies to close PHP php2shell vulnerabilities by October 29. Experts suggest introducing criminal liability for AI owners.