Palo Alto Cloud NGFW/PAN-OS/Prisma Access DNS Proxy/DNS Server heap-based overflow

Summaryinfo

A vulnerability marked as critical has been reported in Palo Alto Cloud NGFW, PAN-OS and Prisma Access. Affected by this issue is some unknown functionality of the component DNS Proxy/DNS Server. This manipulation causes heap-based overflow. This vulnerability is handled as CVE-2026-0264. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access (the affected version is unknown). It has been declared as critical. Affected by this vulnerability is an unknown code of the component DNS Proxy/DNS Server. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at security.paloaltonetworks.com. This vulnerability is known as CVE-2026-0264 since 11/03/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/13/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30065). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Palo Alto

Name

• Cloud NGFW
• PAN-OS
• Prisma Access

License

• commercial

Website

• Vendor: https://www.paloaltonetworks.com/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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