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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.

PUBLISHED Reserved 2025-11-03 | Published 2026-05-13 | Updated 2026-05-13 | Assigner palo_alto




HIGH: 7.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:U/AU:Y/R:U/V:C/RE:H/U:Red

The risk is highest for PA-Series hardware firewalls as there is a potential risk of arbitrary code execution

MEDIUM: 6.6CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/AU:Y/R:A/V:D/RE:M/U:Amber

The risk is lower for VM-Series firewalls, as the impact is limited to a Denial of Service condition

Problem types

CWE-122 Heap-based Buffer Overflow

Product status

Default status
unaffected

All (custom)
unaffected

Default status
unaffected

12.1.0 (custom) before 12.1.7, 12.1.4-h5
affected

11.2.0 (custom) before 11.2.12, 11.2.10-h6, 11.2.7-h13, 11.2.4-h17
affected

11.1.0 (custom) before 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33
affected

10.2.0 (custom) before 10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34
affected

Default status
unaffected

All (custom)
unaffected

Timeline

2026-05-13:Initial Publication.

Credits

Palo Alto Networks thanks an external reporter and our internal security research teams for discovering and reporting this issue. other

References

security.paloaltonetworks.com/CVE-2026-0264 vendor-advisory

cve.org (CVE-2026-0264)

nvd.nist.gov (CVE-2026-0264)

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