Since 2021, Windows XP’s root certificates have been expiring en masse. Without updates, your XP machine cannot validate SSL certificates for HTTPS websites, verify signed drivers, or even install modern antivirus signatures. The project includes updated certificate trust lists (CTLs) that extend functionality into 2026.
Projects like 86Box and PCem will incorporate "auto-update" features that inject patches into a virtual XP environment from the host OS, bypassing XP’s network stack entirely. windows xp legacy update