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

CVE-2026-88779 · CISA KEV · October 4, 2026

Summary

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.

From CISA, quoted as published. Check the source before acting.

What to do

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 required action, quoted.

Affected products

Vendor	Product	Affected versions	Fixed
Citrix	NetScaler	—	—

Why it's on these mode pages

Maritime: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Pipeline: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Freight rail: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Passenger rail and transit: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Highway and motor carrier: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Postal and parcel: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)

Change history

November 9, 2026: First collected by Watch

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