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Citrix Urges Immediate Patching of Critical NetScaler Vulnerability

Citrix disclosed CVE-2026-107406 (CVSS 9.5), a critical memory overflow in NetScaler ADC and NetScaler Gateway that can lead to remote code execution or denial of service when appliances are configured as a SAML SP or SAML IdP, also affecting Secure Private Access Hybrid deployments using NetScaler. Patches are available in versions 14.1-73.46, 13.1-64.29, and the corresponding FIPS/NDcPP builds; Citrix says it is not aware of exploitation yet but urges immediate upgrades. The bulletin follows two other recently exploited NetScaler RCE/DoS zero-days (CVE-2026-88771, CVE-2026-88772) used against government, financial, education, legal, and professional-services organizations, and a separate DoS zero-day (CVE-2026-88779).