Main Vulnerability Database Vulnerabilities #VU124257

Out-of-bounds read in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2026-3055

Published: March 23, 2026 / Updated: May 20, 2026

Vulnerability identifier: #VU124257

CSH Severity: Critical

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L]

CVE-ID: CVE-2026-3055

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerability details

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition in SAML IDP. A remote attacker can send a specially crafted request the appliance, trigger an out-of-bounds read error and read contents of memory on the system.

Successful exploitation of the vulnerability may lead to full system compromise.

Affected software

Citrix Netscaler ADC
Citrix NetScaler Gateway

How to mitigate CVE-2026-3055

Install updates from vendor's website.

Citrix Netscaler ADC - addressed in versions 13.1-62.23, 14.1-66.59
Citrix NetScaler Gateway - addressed in versions 13.1-62.23, 14.1-66.59

Links to Public Exploits and PoC-codes

External References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300

Related Security Bulletins

Remote code execution in Citrix Netscaler ADC and Citrix NetScaler Gateway