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Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88779

Jeff Silverman

2 min read

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Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88779

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Description of Problem

A vulnerability has been discovered in Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway). Refer below for further details.

Affected Versions

The following supported versions of NetScaler are affected by the vulnerability:  

  • Citrix NetScaler ADC and Citrix NetScaler Gateway 14.1 BEFORE 14.1-73.41
  • Citrix NetScaler ADC and Citrix NetScaler Gateway 13.1 BEFORE 13.1-64.28
  • Citrix NetScaler ADC FIPS BEFORE 14.1-73.41 FIPS
  • Citrix NetScaler ADC FIPS and NDcPP BEFORE 13.1-37.282
Additional Note

Secure Private Access Hybrid deployments using NetScaler instances are also affected by the vulnerabilities. Customers need to upgrade these NetScaler instances to the recommended NetScaler builds to address the vulnerabilities.

This bulletin only applies to customer-managed Citrix NetScaler ADC (“NetScaler ADC”) and Citrix NetScaler Gateway (“NetScaler Gateway”). Cloud Software Group upgrades the Citrix-managed cloud services and Citrix-managed Adaptive Authentication with the necessary software updates.  

Details

NetScaler ADC and NetScaler Gateway is affected by the vulnerability described below:

CVE-IDDescriptionPre-conditionsCWECVSSv4
CVE-2026-88779
Memory overflow vulnerability  leading to Denial of Service		NetScaler ADC or NetScaler Gateway must be configured as a
-SAML SP
OR
-SAML IdP
CWE-119 – Improper Restriction of Operations within the Bounds of a Memory BufferCVSS v4.0 Base Score: 8.7

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N



Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible:

  • NetScaler ADC and NetScaler Gateway 14.1-73.41 and later releases
  • NetScaler ADC and NetScaler Gateway 13.1-64.28 and later releases of 13.1
  • NetScaler ADC 14.1-FIPS 14.1-73.41 FIPS and later releases of 14.1-FIPS
  • NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.282 and later releases of 13.1-FIPS and 13.1-NDcPP
Steps to Determine if an Appliance Meets CVE Preconditions

Customers can determine whether their NetScaler deployment meets the precondition by inspecting their NetScaler configuration for entries matching either of the following:

  • Appliance is configured as a SAML SP 

add authentication samlAction

OR

  • Appliance is configured as a SAML IdP 

add authentication samlIdPProfile

More Information

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88779