Citrix NetScaler Zero-Day Vulnerability (CVE-2026-88779) Actively Exploited in Targeted Attacks

Citrix has released security updates for a high-severity memory overflow vulnerability (CVE-2026-88779) in NetScaler ADC and Citrix NetScaler Gateway. The flaw, with a CVSS score of 8.7, is being actively exploited in targeted zero-day attacks and can lead to denial-of-service under specific SAML authentication deployment conditions. CISA has added this to its Known Exploited Vulnerabilities catalog.