Palo Alto Networks Cloud NGFW/PAN-OS/Prisma Access XML Processing buffer overflow

Summaryinfo

A vulnerability was found in Palo Alto Networks Cloud NGFW, PAN-OS and Prisma Access. It has been rated as very critical. The impacted element is an unknown function of the component XML Processing. This manipulation causes buffer overflow. This vulnerability is tracked as CVE-2026-0310. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Palo Alto Networks Cloud NGFW, PAN-OS and Prisma Access (version unknown). It has been declared as very critical. Affected by this vulnerability is an unknown function of the component XML Processing. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A buffer overflow vulnerability in the XML processing functionality of Palo Alto Networks PAN-OS® software enables an unauthenticated attacker with network access to the management web or dataplane interface to cause a denial of service (DoS) condition on VM-Series firewalls or execute arbitrary code with root privileges on the PA-Series firewalls. The security risk posed by this issue is minimized when the management interface is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . Panorama is impacted by this vulnerability.

It is possible to read the advisory at security.paloaltonetworks.com. This vulnerability is known as CVE-2026-0310 since 11/03/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026).

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 CERT Bund (WID-SEC-2026-3295). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Palo Alto Networks PAN-OS

Productinfo

Type

• Firewall Software

Vendor

• Palo Alto Networks

Name

• Cloud NGFW
• PAN-OS
• Prisma Access

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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