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

Description

Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.

Need help remediating this vulnerability?

Our team helps organizations patch, mitigate, and respond to CISA KEV advisories fast.

Talk to an engineer