CVE ID CVE-2026-0300 Vulnerability Name Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability Project: Palo Alto Networks Product: PAN-OS Date Date Added: 2026-05-06 Due Date: 2026-05-09 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. Known To Be Used in Ransomware Campaigns? Unknown Action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required.…