NetScaler ADC/Gateway SAML IDP Memory Overread (<14.1)
CVE-2026-3055 Published on March 23, 2026
Insufficient input validation leading to memory overread
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Known Exploited Vulnerability
This Citrix NetScaler Out-of-Bounds Read Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.
The following remediation steps are recommended / required by April 2, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Affected Versions
NetScaler ADC:- Version 14.1 and below 66.59 is affected.
- Version 13.1 and below 62.23 is affected.
- Version 13.1 FIPS and NDcPP and below 37.262 is affected.
- Version 14.1 and below 66.59 is affected.
- Version 13.1 and below 62.23 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.