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 service (DoS) condition. Panorama, Cloud NGFW, and Prisma® Access are not impacted by these vulnerabilities.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (29.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
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)
References
- security.paloaltonetworks.com/CVE-2026-0263 (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.