Citrix Patches Critical NetScaler Flaw That Could Enable RCE in SAML Deployments

Citrix has released patches for yet another critical security flaw impacting NetScaler ADC and NetScaler Gateway that could result in remote code execution or denial-of-service (DoS) under certain conditions.

" CVE-2026-107406 is a memory overflow vulnerability that may lead to remote code execution or denial-of-service under specific configuration conditions," Citrix said.

The vulnerability carries a CVSS score of 9.5 out of 10.0. There is no evidence that the issue has been exploited in the wild. Citrix has credited Michael Tucker, Chew Keong Tan, and Alex Bernier of the JPMorgan Chase XOR Team, along with Maxim Suhanov, for discovering and reporting the flaw.

Successful exploitation hinges on the NetScaler deployments being configured as a SAML identity provider (IdP) or service provider (SP). Customers can determine if their instances meet the criteria by checking the configuration for entries like below -

The issue impacts the following versions -

"Secure Private Access Hybrid deployments using NetScaler instances are also affected by the vulnerability," Citrix warned . "Customers need to upgrade these NetScaler instances to the recommended NetScaler versions to address the vulnerability."

The shortcoming has been addressed in the versions below -

The development comes as three different flaws in NetScaler ADC and NetScaler Gateway appliances ( CVE 2026-88771 , CVE 2026-88772 , and CVE 2026-88779 ) have come under active exploitation in the wild.