CVE-2026-3055

CRITICAL KEV NUCLEI

Insufficient input validation leading to memory overread

Title source: cna
STIX 2.1

Exploitation Summary

CVE-2026-3055 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added March 30, 2026. EIP tracks 7 public exploits from researchers including SecureWithUmer, NetVanguard-cmd, l0lsec, including a Metasploit module auxiliary/scanner/http/citrix_netscaler_cve_2026_3055. A Nuclei detection template is also available.

AI-analyzed exploit summary This repository contains a Python-based scanner for detecting CVE-2026-3055, a memory leak vulnerability in Citrix NetScaler. The scanner checks for the presence of the NSC_TASS cookie and analyzes its contents for sensitive data leaks, including session IDs and HTTP headers, but does not exploit the vulnerability.

Description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

Exploits (7)

github SCANNER
by SecureWithUmer · c++poc
https://github.com/SecureWithUmer/CVE-2026-PoCs/tree/main/2026/CVE-2026-3055

This repository contains a Python-based scanner for detecting CVE-2026-3055, a memory leak vulnerability in Citrix NetScaler. The scanner checks for the presence of the NSC_TASS cookie and analyzes its contents for sensitive data leaks, including session IDs and HTTP headers, but does not exploit the vulnerability.

Classification
Scanner 98%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Citrix NetScaler (versions 13.1 < 13.1-62.23, 14.1 < 14.1-60.58)
No auth needed
Prerequisites: Network access to the target NetScaler instance · Target must expose the /wsfed/passive?wctx endpoint
mistral-large-3 · analyzed Jul 08, 2026 Full analysis →
nomisec SUSPICIOUS
by NetVanguard-cmd · poc
https://github.com/NetVanguard-cmd/CVE-2026-3055

The repository claims to exploit CVE-2026-3055, a memory overread vulnerability in NetScaler ADC/Gateway SAML IDP, but provides no actual exploit code. Instead, it directs users to an external download link (tinyurl.com), which is a common tactic for distributing malware or fake exploits.

Classification
Suspicious 95%
Attack Type
Other
Complexity
Theoretical
Reliability
Theoretical
Target: NetScaler ADC and NetScaler Gateway (SAML IDP configuration)
No auth needed
Prerequisites: Reachable vulnerable target · Predictable user/workflow context
mistral-large-3 · analyzed Apr 19, 2026 Full analysis →
nomisec SCANNER
by l0lsec · poc
https://github.com/l0lsec/check-cve-2026-3055-netscaler

This repository contains a Python script that scans for CVE-2026-3055, a memory overread vulnerability in Citrix NetScaler appliances configured as SAML Identity Providers. The script sends a crafted SAML request to detect the presence of the vulnerability by checking for specific response markers.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Citrix NetScaler / NetScaler Gateway (configured as SAML IdP)
No auth needed
Prerequisites: Target must be configured as a SAML Identity Provider · Access to the `/saml/login` endpoint
mistral-large-3 · analyzed Apr 09, 2026 Full analysis →
nomisec SCANNER
by fevar54 · poc
https://github.com/fevar54/CVE-2026-3055-Scanner---Herramienta-de-Detecci-n

This repository contains a Python-based scanner for detecting CVE-2026-3055, a memory overread vulnerability in Citrix NetScaler ADC and Gateway. The tool checks for memory leaks via the NSC_TASS cookie and extracts session IDs from leaked data.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Citrix NetScaler ADC and Gateway
No auth needed
Prerequisites: network access to target · Python 3.8+
mistral-large-3 · analyzed Apr 09, 2026 Full analysis →
nomisec SCANNER
by fevar54 · poc
https://github.com/fevar54/CVE-2026-3055---Citrix-NetScaler-Memory-Overread-PoC

The repository contains a Python script that checks for the presence of CVE-2026-3055 in Citrix NetScaler by sending a request to the vulnerable endpoint and analyzing the response cookies for signs of memory leakage. It does not include exploit code but provides a detection mechanism.

Classification
Scanner 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Citrix NetScaler ADC and NetScaler Gateway (SAML IDP configuration)
No auth needed
Prerequisites: Network access to the target NetScaler instance
mistral-large-3 · analyzed Apr 09, 2026 Full analysis →
nomisec WRITEUP
by 0xBlackash · poc
https://github.com/0xBlackash/CVE-2026-3055

This repository provides a detailed technical analysis of CVE-2026-3055, an unauthenticated out-of-bounds memory read vulnerability in Citrix NetScaler ADC and Gateway when configured as a SAML Identity Provider (IdP). It includes vulnerability details, affected versions, remediation steps, and references but does not contain exploit code.

Classification
Writeup 100%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Theoretical
Target: Citrix NetScaler ADC and Gateway (versions 14.1 before 14.1-66.59, 13.1 before 13.1-62.23, and 13.1 FIPS/NDcPP before 13.1-37.262)
No auth needed
Prerequisites: Target must be configured as a SAML Identity Provider (IdP) · Network reachability to SAML endpoints
mistral-large-3 · analyzed Apr 09, 2026 Full analysis →
metasploit SCANNER
by watchTowr, sfewer-r7 · rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/citrix_netscaler_cve_2026_3055.rb

This Metasploit module scans for CVE-2026-3055, a memory leak vulnerability in Citrix ADC (NetScaler) SAML IdP configurations. It detects the presence of the vulnerability by checking for leaked memory in the NSC_TASS cookie and attempts to extract session cookies from the leaked data.

Classification
Scanner 100%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Citrix ADC (NetScaler) configured as a SAML IdP
No auth needed
Prerequisites: Target must be a Citrix ADC (NetScaler) configured as a SAML IdP · Network access to the target on port 443
mistral-large-3 · analyzed May 20, 2026 Full analysis →

Nuclei Templates (1)

Citrix NetScaler SAML IDP - Memory Overread
CRITICALVERIFIEDby watchtowr,shaikhyaser,DhiyaneshDk
Shodan: title:"NetScaler Gateway" || title:"NetScaler AAA" || http.favicon.hash:-1166125415 || http.favicon.hash:-1292923998
FOFA: title="NetScaler Gateway" || title="NetScaler AAA" || icon_hash="-1166125415" || icon_hash="-1292923998"

Scores

CVSS v3 9.8
EPSS 0.7834
EPSS Percentile 99.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable yes
Technical Impact total

Details

CISA KEV 2026-03-30
VulnCheck KEV 2026-03-29
ENISA EUVD EUVD-2026-14546
CWE
CWE-125
Status published
Products (8)
citrix/netscaler_application_delivery_controller 13.1 - 13.1-37.262 (2 CPE variants)
citrix/netscaler_application_delivery_controller 13.1 - 13.1-62.23
citrix/netscaler_gateway 13.1 - 13.1-62.23
NetScaler/ADC 13.1 - 62.23
NetScaler/ADC 13.1 FIPS and NDcPP - 37.262
NetScaler/ADC 14.1 - 66.59
NetScaler/Gateway 13.1 - 62.23
NetScaler/Gateway 14.1 - 66.59
Published Mar 23, 2026
KEV Added Mar 30, 2026
Tracked Since Mar 24, 2026