CVE-2026-0300: CRITICAL (CVSS 9.8), Actively Exploited (CISA KEV)

CRITICAL (CVSS 9.8), Actively Exploited (CISA KEV), EPSS 36.2%. A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.