Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-107406
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 Citrix NetScaler ADC and Citrix NetScaler Gateway are affected by the vulnerability if they meet the following conditions:
NetScaler ADC or NetScaler Gateway must be configured as a SAML SP or SAML IdP, subject to the following version-specific requirements:
For the following versions: Applicable only when configured as a SAML IdP:
- NetScaler ADC and NetScaler Gateway between 14.1-73.37 and 14.1-73.41, inclusive
- NetScaler ADC 14.1-FIPS between 14.1-73.37 FIPS and 14.1-73.41 FIPS, inclusive
- NetScaler ADC and NetScaler Gateway between 13.1-64.23 and 13.1-64.28, inclusive
- NetScaler ADC 13.1-FIPS between 13.1-NDcPP 13.1-37.279 and 13.1- 37.282, inclusive
For the following versions: Applicable only when configured as a SAML SP or SAML IdP:
- NetScaler ADC and NetScaler Gateway before 14.1-73.37
- NetScaler ADC 14.1-FIPS before 14.1-73.37 FIPS
- NetScaler ADC and NetScaler Gateway before 13.1-64.23
- NetScaler ADC 13.1-FIPS before 13.1-NDcPP 13.1-37.279
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-ID | Description | Pre-conditions | CWE | CVSSv4 |
| CVE-2026-107406 | Memory overflow vulnerability leading to Remote Code Execution or Denial of Service | NetScaler ADC or NetScaler Gateway must be configured as a SAML SP or SAML IdP, subject to the following version-specific requirements: -For the following versions: Applicable only when configured as a SAML IdP: -NetScaler ADC and NetScaler Gateway between 14.1-73.37 and 14.1-73.41, inclusive -NetScaler ADC 14.1-FIPS between 14.1-73.37 FIPS and 14.1-73.41 FIPS, inclusive -NetScaler ADC and NetScaler Gateway between 13.1-64.23 and 13.1-64.28, inclusive -NetScaler ADC 13.1-FIPS between 13.1-NDcPP 13.1-37.279 and 13.1- 37.282, inclusive For the following versions: Applicable only when configured as a SAML SP or SAML IdP: -NetScaler ADC and NetScaler Gateway before 14.1-73.37 -NetScaler ADC 14.1-FIPS before 14.1-73.37 FIPS -NetScaler ADC and NetScaler Gateway before 13.1-64.23 -NetScaler ADC 13.1-FIPS before13.1-NDcPP 13.1-37.279 | CWE-119 – Improper Restriction of Operations within the Bounds of a Memory Buffer | CVSS v4.0 Base Score:9.5 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L) |
Recommended Action
Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the following updated versions as soon as possible:
- Citrix NetScaler ADC and Citrix NetScaler Gateway 14.1-73.46 and later releases
- Citrix NetScaler ADC and Citrix NetScaler Gateway 13.1-64.29 and later releases of 13.1
- Citrix NetScaler ADC 14.1-FIPS 14.1-73.46 FIPS and later releases of 14.1-FIPS
- Citrix NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1.37.283 and later releases of 13.1-FIPS and 13.1-NDcPP
Steps to Determine if an Appliance Meets CVE Preconditions
Instructions: Customers can determine whether their NetScaler deployment is configured as a SAML identity provider (IdP) or service provider (SP) by checking its configuration for entries matching either of the following:
- Appliance is configured as a SAML SP
add authentication samlAction
- Appliance is configured as a SAML IdP
add authentication samlIdPProfile
(Note: For version-specific requirements, see the “Affected Versions” section above.)