Critical Citrix NetScaler VPN Flaw CVE-2026-88772 Risks Denial of Service

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A critical vulnerability, CVE-2026-88772, has been identified in Citrix NetScaler ADC and Gateway. The flaw is a memory overflow with a CVSS v4 score of 9.5 and can lead to a denial-of-service condition on VPN concentrators. Over 239,000 internet-facing assets may be affected. Citrix has released fixed software builds to address this and seven other vulnerabilities. Multiple national cybersecurity agencies have issued advisories regarding the flaw.

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