CVE-2026-0318 Panorama Log Processor DoS Vulnerability Explained

Palo Alto Networks has released an advisory for CVE-2026-0318, a medium-severity denial of service vulnerability affecting the Panorama management platform. The flaw resides in the log processing functionality and involves a stack-based buffer overflow. This issue is specific to PAN-OS software running on Panorama appliances configured in panorama system mode or management-only mode with a Log Collector.

Root cause

The vulnerability stems from improper checks for unusual conditions, classified as CWE-754. When the log processing component handles certain inputs, it fails to validate buffer boundaries correctly. This oversight allows an attacker to overflow the stack memory. The resulting corruption disrupts normal operation, leading to a system crash or forced entry into maintenance mode. Palo Alto Networks rates the base CVSS score at 8.2, though the time-based score is 4.6 due to required attacker conditions.

Attack path

An attacker must interact with the log processing feature of the Panorama instance. The advisory notes that repeated attempts to trigger the condition cause the service disruption. The vulnerability requires the target to have a Collector Group configured. It applies only to Panorama instances operating in panorama system mode or management-only mode with Log Collector. Standalone PAN-OS firewalls, Cloud NGFW, and Prisma Access are explicitly stated as not affected.

Affected versions

• Panorama versions prior to 12.1.4-h12, 12.1.7-h8, or 12.1.10-h2 are vulnerable.
• Panorama versions prior to 11.2.4-h22, 11.2.7-h21, 11.2.10-h15, 11.2.13-h3, or 11.2.15 are vulnerable.
• Panorama versions prior to 11.1.4-h37, 11.1.6-h39, 11.1.7-h11, 11.1.10-h35, 11.1.13-h15, or 11.1.16-h3 are vulnerable.

Mitigation

• Upgrade Panorama to PAN-OS 12.1.4-h12, 12.1.10-h2, or later.
• Upgrade Panorama to PAN-OS 11.2.15 or later, or applicable hotfixes.
• Upgrade Panorama to PAN-OS 11.1.16-h3 or later, or applicable hotfixes.
• Limit access to the Panorama management interface to known good IP addresses to reduce exposure.

Detection notes

Teams should monitor Panorama system logs for unexpected crashes or transitions to maintenance mode. Look for spikes in resource utilization or unexplained service restarts within the management console. Check for connection drops from managed firewalls attempting to sync configurations. If maintenance mode is entered without a scheduled upgrade, investigate recent log ingestion patterns. Validate that no unauthorized IP addresses have accessed the management port. Correlate these events with any unusual network traffic targeting the Panorama appliance to determine if the buffer overflow was triggered.

What to do and how to stay safe: Palo Alto Networks

• Inventory all Panorama instances and verify their current PAN-OS versions against the affected list.
• Restrict inbound access to the Panorama management interface using firewall rules for trusted IPs only.
• Monitor system health logs for signs of instability or unexpected reboots.
• Plan an upgrade to the recommended patched versions as soon as operational maintenance windows allow.

Step-by-step guide: Unpatched Software Myths: Why Common Beliefs Fail to Protect You

General security guidance from the BlueTeam Insider newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Is my standalone firewall affected by CVE-2026-0318?

No, standalone PAN-OS firewalls are not affected by this vulnerability.

Has Palo Alto Networks seen this being exploited in the wild?

No, the vendor states it is not aware of any malicious exploitation of this issue.

Does Prisma Access have this vulnerability?

No, Prisma Access and Cloud NGFW are not affected by this vulnerability.