# CVE-2026-107406 — NetScaler ADC

> As of 2026-10-08, CVE-2026-107406 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in NetScaler ADC, CVSS v4.0 9.5. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-107406, most recently “Citrix NetScaler ADC and Gateway Critical Memory Overflow RCE in SAML SP/IdP Configurations (CVE-2026-107406)”.

**Last updated:** 2026-10-08

## What is CVE-2026-107406?

Memory overflow vulnerability leading to Remote Code Execution or Denial of Service Vulnerability in NetScaler ADC. NetScaler ADC or NetScaler Gateway must be configured as a SAML SP or SAML IdP, subject to the following version-specific requirements: * For the following versions: Applicable only when configured as a SAML IdP: * NetScaler ADC and NetScaler Gateway between 14.1-73.37 and 14.1-73.41, inclusive * NetScaler ADC 14.1-FIPS between 14.1-73.37 FIPS and 14.1-73.41 FIPS, inclusive * NetScaler ADC and NetScaler Gateway between 13.1-64.23 and 13.1-64.28, inclusive * NetScaler ADC 13.1-FIPS between 13.1-NDcPP 13.1-37.279 and 13.1- 37.282, inclusive For the following versions: Applicable only when configured as a SAML SP or SAML IdP: * NetScaler ADC and NetScaler Gateway before 14.1-73.37 * NetScaler ADC 14.1-FIPS before 14.1-73.37 FIPS * NetScaler ADC and NetScaler Gateway before 13.1-64.23 * NetScaler ADC 13.1-FIPS before13.1-NDcPP 13.1-37.279

2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 2 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.5 — Critical (derived from score) (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-08

## Is CVE-2026-107406 being exploited?

No public exploitation evidence for CVE-2026-107406 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-10-08. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- [NetScaler](https://intel.threadlinqs.com/vendors/netscaler): ADC, Gateway

## How to fix CVE-2026-107406

No vendor patch reference has been recorded for CVE-2026-107406 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-107406

1 tracked threat in the Threadlinqs corpus references CVE-2026-107406, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Citrix NetScaler ADC and Gateway Critical Memory Overflow RCE in SAML SP/IdP Configurations (CVE-2026-107406)](https://intel.threadlinqs.com/threat/TL-2026-3078) — CRITICAL · 2026-10-09

## Sources

Enriched from CVE.org, NVD, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-09. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [support.citrix.com](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697191)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-107406
Full detection coverage and IOCs for threats exploiting CVE-2026-107406 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp