CVE-2026-107406

Status: Awaiting AnalysisCritical (9.5)—💥 PoC

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 SP or SAML IdP:

Technical details traces, logs and code from the original report

  *  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

  *  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

CVSS

Version: 4.0
Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Base score: 9.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.47%
Percentile among all scored CVEs: 39
Score date: 10/15/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

📰 Media coverage

Specialised security media that have cited this CVE:

Minuto da Segurança · Citrix NetScaler: falha crítica em SAML pode permitir execução de código e indisponibilidade (10/12/2026)
Canadian Centre for Cyber Security · Citrix security advisory (AV26-1023) (10/9/2026)
The Hacker News · Citrix Patches Critical NetScaler Flaw That Could Enable RCE in SAML Deployments (10/9/2026)
SecurityWeek · Citrix Urges Immediate Patching of Critical NetScaler Vulnerability (10/9/2026)

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access85 %
Primary impactT1059 Command and Scripting Interpreterexecution80 %
Secondary impactT1499.004 Application or System Exploitationimpact75 %

Vulnerabilidad de desbordamiento de memoria en servicio SAML expuesto en red sin privilegios. Permite RCE (T1059) o DoS (T1499.004) según el texto.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management Filter Network Traffic Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation

Affected technologies (2)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Citrix — Netscaler ADC^AI Citrix — Netscaler Gateway^AI

CWEs

CWE-119

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-107406",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-107406",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-09T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.5,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "LOW",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
      "affectedData": [
        {
          "vendor": "NetScaler",
          "product": "ADC",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "14.1-73.46",
              "versionType": "patch"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "13.1-64.29",
              "versionType": "patch"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "14.1-73.46 FIPS",
              "versionType": "patch"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "13.1.37.283 FIPS",
              "versionType": "patch"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "NetScaler",
          "product": "Gateway",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "14.1-73.46",
              "versionType": "patch"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "13.1-64.29",
              "versionType": "patch"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-10-08T22:17:26.847",
  "references": [
    {
      "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697191",
      "source": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"
    },
    {
      "url": "https://community.citrix.com/techzone-blogs/110_security-updates/protecting-customers-immediate-guidance-for-cve-2026-107406-in-netscaler-adc-and-netscaler-gateway-r1631/",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memory overflow vulnerability leading to Remote Code Execution or Denial of Service Vulnerability in NetScaler ADC.\n\n\nNetScaler ADC or NetScaler Gateway must be configured as a SAML SP or SAML IdP, subject to the following version-specific requirements:\n\n\n\n \n\n  *  For the following versions: Applicable only when configured as a SAML IdP:\n  *  NetScaler ADC and NetScaler Gateway between 14.1-73.37 and 14.1-73.41, inclusive\n  *  NetScaler ADC 14.1-FIPS between 14.1-73.37 FIPS and 14.1-73.41 FIPS, inclusive\n  *  NetScaler ADC and NetScaler Gateway between 13.1-64.23 and 13.1-64.28, inclusive\n  *  NetScaler ADC 13.1-FIPS between 13.1-NDcPP 13.1-37.279 and 13.1- 37.282, inclusive\n\n\n\n\n \n\n\n\nFor the following versions: Applicable only when configured as a SAML SP or SAML IdP:\n\n  *  NetScaler ADC and NetScaler Gateway before 14.1-73.37 \n  *  NetScaler ADC 14.1-FIPS before 14.1-73.37 FIPS \n  *  NetScaler ADC and NetScaler Gateway before 13.1-64.23\n  *  NetScaler ADC 13.1-FIPS before13.1-NDcPP 13.1-37.279"
    }
  ],
  "lastModified": "2026-10-10T04:18:09.503",
  "sourceIdentifier": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"
}