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CISA KEV 04 Oct 2026: 1 exploited flaw in Citrix

1 vulnerability
Conceptual illustration: An enterprise router and firewall appliance, shielded network ports and a precise glowing patch plate. Headline: NETWORK SECURITY.

AI-generated illustration by CyberShitty. Not a photograph or a document from the organisations named.

On 4 October 2026, CISA added 1 actively exploited vulnerability affecting Citrix to its Known Exploited Vulnerabilities catalog. If you run any of these products, patch or mitigate now — exploitation is already happening.

CVE-2026-88779Federal deadline

In this section

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

Citrix / NetScaler / CWE-119

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA links: BOD 26-04 · Forensics Triage Requirements