CVE-2026-0300: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

Palo Alto Networks PAN-OS has a critical vulnerability in its User-ID Authentication Portal (a service that authenticates users trying to access the network) that allows unauthenticated attackers to write data outside the intended memory bounds (out-of-bounds write), potentially letting them run any code with root privileges on firewalls. This vulnerability is currently being actively exploited by attackers in real-world attacks.