High [CVE-2026-88779] Understanding and Addressing CVE-2026-88779 in Citrix NetScaler ADC and Citrix NetScaler Gateway
This high-severity NetScaler (Citrix) advisory covers CVE-2026-88779 affecting Gateway.
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Summary
CVE-2026-88779 is a memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway that can lead to denial of service under specific deployment conditions. The issue affects customer-managed NetScaler deployments running affected supported versions when the required preconditions are met.
Customers should review their deployed versions and configurations, then install the relevant updated versions as soon as possible.
Affected Versions The following supported versions are affected when the CVE preconditions (see the section “How to Determine Whether a NetScaler deployment Meets the Preconditions” below) apply: NetScaler ADC and NetScaler Gateway 14.1 before 14.1-73.41 NetScaler ADC and NetScaler Gateway 13.1 before 13.1-64.28 NetScaler ADC FIPS before 14.1-73.41 FIPS NetScaler ADC FIPS and NDcPP before 13.1-37.282 What Is the Issue?
CVE-2026-88779 is categorized as CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer. The vulnerability has a CVSS v4.0 base score of 8.7.
Citrix has observed targeted attacks on unmitigated NetScaler deployments which can lead to Denial of Service. If the condition is triggered repeatedly, the service may remain unavailable.
Our analysis indicates that this issue affects service availability, and we have not identified an impact on the integrity of customer data.
CISA Known Exploited Vulnerability
- Listed:
- Oct 4, 2026 · federal remediation due Oct 7, 2026
- 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.
- Ransomware use:
- Unknown
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- NetScaler ADC and NetScaler Gateway 14.1 before 14.1-73.41
- NetScaler ADC and NetScaler Gateway 13.1 before 13.1-64.28
- NetScaler ADC FIPS before 14.1-73.41
- NetScaler ADC FIPS and NDcPP before 13.1-37.282
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- 14.1-73.41
- 13.1-64.28
- 13.1-37.282
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Upgrade to a fixed build: 14.1-73.41, 13.1-64.28, 13.1-37.282 or later for your release line.
- Citrix strongly urges all customers to install the latest versions as soon as possible.
- Customers can block suspicious IP addresses by using the blocklist functionality of NetScaler.
- As part of a defense-in-depth approach, customers should review relevant network and perimeter controls and, where appropriate, use firewall rules to block traffic from IP addresses identified as sources of attack activity.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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