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CVE-2026-107406 – Memory Overflow (RCE / DoS) in SAML Configurations – NetScaler ADC and Gateway bef

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Summary

CVE-2026-107406 is a critical memory overflow vulnerability in NetScaler ADC and NetScaler Gateway that can lead to remote code execution or denial of service. It affects appliances configured as a SAML Service Provider (SP) or SAML Identity Provider (IdP). The CVE record rates it 9.5 (Critical) under CVSS v4.0.

Technical details

  • Root cause: Memory overflow in NetScaler ADC and Gateway when SAML SP or IdP functionality is configured.
  • Trigger conditions: The appliance must be configured as a SAML SP or SAML IdP. Some builds (14.1-73.37 through 14.1-73.41 and 13.1-64.23 through 13.1-64.28) are affected only when configured as a SAML IdP.
  • Attack vector: Network. No privileges or user interaction are required. Attack complexity is rated High.
  • Impact: Remote code execution or denial of service.

Affected software

  • NetScaler ADC and NetScaler Gateway before 14.1-73.46
  • NetScaler ADC and NetScaler Gateway before 13.1-64.29
  • NetScaler ADC FIPS before 14.1-73.46 and before 13.1-37.283

Severity

  • CVSS v4.0 base score: 9.5 (Critical)
  • 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
  • The record gives no CVSS v3.1 score.

Mitigation and recommended actions

  • Immediate: Upgrade to NetScaler ADC / Gateway 14.1-73.46 or later, or 13.1-64.29 or later. For FIPS variants, upgrade to 14.1-73.46 FIPS or later, or 13.1-37.283 FIPS or later.
  • Identify appliances configured as a SAML SP or IdP, and prioritize them for patching.
  • Follow the NetScaler security bulletin (CTX697191) for further guidance. No workaround was found in the sources reviewed.

References

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