CISA Warns of Exploited Citrix NetScaler Vulnerability Causing DoS Attacks

The Cybersecurity and Infrastructure Security Agency (CISA) has added a new Citrix NetScaler vulnerability, CVE-2026-88779, to its Known Exploited Vulnerabilities catalog. This memory overflow bug can trigger denial-of-service attacks on unmitigated NetScaler ADCs and Gateways. Citrix has confirmed targeted attacks, prompting CISA to mandate federal agencies patch the flaw by Wednesday, highlighting the urgent need for mitigation to prevent service disruptions.