---
id: "CVE-2026-3055"
kind: "vulnerability"
aliases: ["CVE-2026-3055"]
title: "Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Citrix NetScaler", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "citrix netscaler application delivery controller", "fixed": ["13.1-37.262"], "affected": ">= 13.1, < 13.1-37.262", "ecosystem": "vendor"}, {"name": "citrix netscaler application delivery controller", "fixed": ["13.1-62.23"], "affected": ">= 13.1, < 13.1-62.23", "ecosystem": "vendor"}, {"name": "citrix netscaler application delivery controller", "fixed": ["14.1-60.58"], "affected": ">= 14.1, < 14.1-60.58", "ecosystem": "vendor"}, {"name": "citrix netscaler gateway", "fixed": ["13.1-62.23"], "affected": ">= 13.1, < 13.1-62.23", "ecosystem": "vendor"}, {"name": "citrix netscaler gateway", "fixed": ["14.1-60.58"], "affected": ">= 14.1, < 14.1-60.58", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["citrix-netscaler", "exploited", "infrastructure", "netscaler-gateway", "saml-idp", "self-hosted"]
not_affected_if: ["managed-hosting", "not-saml-idp"]
published_at: "2026-03-23T21:17:17+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-3055", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3055", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

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

Citrix NetScaler ADC and NetScaler Gateway contain an out-of-bounds read flaw when configured as a SAML identity provider. An attacker can read memory beyond the intended buffer, which can expose sensitive data held in the appliance's memory.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Citrix NetScaler affected ? fixed ?
- vendor:citrix netscaler application delivery controller affected >= 13.1, < 13.1-37.262 fixed 13.1-37.262
- vendor:citrix netscaler application delivery controller affected >= 13.1, < 13.1-62.23 fixed 13.1-62.23
- vendor:citrix netscaler application delivery controller affected >= 14.1, < 14.1-60.58 fixed 14.1-60.58
- vendor:citrix netscaler gateway affected >= 13.1, < 13.1-62.23 fixed 13.1-62.23
- vendor:citrix netscaler gateway affected >= 14.1, < 14.1-60.58 fixed 14.1-60.58

## How to check

Check whether the NetScaler is configured as a SAML IDP (unknown exact command in sources).
Review the vendor advisory for affected builds: unknown in sources.
Confirm the appliance firmware version against the vendor's fixed list: unknown in sources.

## Fix

Apply the vendor mitigation or fixed firmware per Citrix guidance; if unavailable, discontinue use of the product per CISA direction.
Fixed version: unknown in sources.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-3055
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-3055

## From the sources

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.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_