CVE-2026-8655: Citrix NetScaler Application Delivery Controller

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Multiple Memory overflow vulnerabilities in NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if NetScaler ADC is configured as an LB of type Oracle OR NetScaler ADC is configured as a DNS Proxy OR NetScaler ADC is configured as a DNS recursive resolver deployment

Affected products

• Citrix NetScaler Application Delivery Controller: before 13.1-37.272 (fixed in 13.1-37.272); from 13.1, before 13.1-63.18 (fixed in 13.1-63.18); from 14.1, before 14.1-72.61 (fixed in 14.1-72.61); version 14.1-66.68 only
• Citrix NetScaler Gateway: from 13.1, before 13.1-63.18 (fixed in 13.1-63.18); from 14.1, before 14.1-72.61 (fixed in 14.1-72.61)

Published 2026-06-30. Last modified 2026-07-01.