CVE-2026-0264 PAN-OS: Heap-Based Buffer Overflow in DNS Proxy and DNS Server Allows Unauthenticated Remote Code Execution

High 7.2 Published 13 May 2026 Updated 15 Oct 2026

Unauthenticated attackers can cause denial of service or execute arbitrary code on PAN-OS firewalls via crafted network traffic to DNS features.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-0264?

CVE-2026-0264 is a high-severity memory corruption vulnerability in Paloaltonetworks Pan-Os, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A buffer overflow vulnerability in the DNS proxy and DNS Server features of Palo Alto Networks PAN-OS® Software allows an unauthenticated attacker with network access to cause a denial of service (DoS) condition (all PAN-OS platforms except Cloud NGFW and Prisma Access) or potentially execute arbitrary code by sending specially crafted network traffic (PA-Series hardware only).

Panorama, Cloud NGFW, and Prisma® Access are not impacted by this vulnerability.

Weakness: CWE-122

Which versions are affected by CVE-2026-0264?

It affects 2 products.

Products include Paloaltonetworks Pan-Os, Siemens Ruggedcom Ape1808 Firmware.

How do I fix CVE-2026-0264?

No fix has been published for CVE-2026-0264 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-0264 being exploited?

There is no known exploitation of CVE-2026-0264 in the wild and no public exploit code.

All Paloaltonetworks Pan-Os vulnerabilities

Sources

Also known as GHSA-99hw-j87x-3cgm.