What is CVE-2026-0263?

CVE-2026-0263 is a critical-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-05-13.

How severe is CVE-2026-0263?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Palo Alto Networks Cloud Ngfw

CVE-2026-0263

A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of servic…

Vulnerability class: Buffer Overflow

EPSS: 0.004 (29.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Palo Alto Networks Cloud Ngfw — versions All
Palo Alto Networks Pan-os — versions 12.1.0, 11.2.0, 11.1.0
Palo Alto Networks Prisma Access — versions All
Paloaltonetworks Pan-os — versions 11.1.4, 11.1.6, 11.1.7

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

psirt@paloaltonetworks.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0263?: CVE-2026-0263 is a critical-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-05-13.
How severe is CVE-2026-0263?: Critical severity. CVSS v3 base score is 9.8 out of 10.