Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

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• cpe citrix/netscaler application delivery controllerversion unspecified
• cpe citrix/netscaler gatewayversion unspecified
• vendor Citrix NetScalerversion unspecified
• vendor Citrix NetScaler ADC and NetScaler Gatewayversion unspecified

How to fix CVE-2026-88779

• Recommended remediation

  Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA due date Oct 7, 2026.

• Official advisories

  • CISA Cybersecurity Advisories · cisa.gov
  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • Cisco Talos · blog.talosintelligence.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 3, 2026 · Catalog

   Detected

   Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

2. Oct 4, 2026 · CISA KEV

   Known exploited

   Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating

3. Oct 5, 2026 · Catalog

   Updated

   Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

4. Oct 7, 2026 · CISA KEV

   Remediation due

   Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating

Sources

• CISA Cybersecurity AdvisoriesGovernment advisoryCVE-2026-88779

  CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-88779 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability This type of vulnerability i

  cisa.gov
• CISA KEVConfirmed exploitationCVE-2026-88779

  Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

  cisa.gov
• CVE.orgVulnerability recordCVE-2026-88779

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-88779

  30-day exploitation probability 0.6%

  first.org
• NIST NVDVulnerability recordCVE-2026-88779

  Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

  nvd.nist.gov
• Cisco TalosVendor advisoryCVE-2026-88779

  Pierre's debut newsletter explores the messy, real-world side of risk management and how to keep vital systems running when a perfect patch isn't an option.

  blog.talosintelligence.com
• VulnCheck KEVConfirmed exploitationCVE-2026-88779

  Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

  vulncheck.com

References

• CISA note · community.citrix.com
• CISA note · nvd.nist.gov
• CISA note · support.citrix.com
• US Government Resource · cisa.gov
• CISA note · cisa.gov
• CISA note · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · rapid7.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.