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CVE-2026-88779

Memory overflow vulnerability leading to Denial of Service

  • High 8.7
  • Exploited: added to CISA KEV 4 Oct 2026

Description

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.

Key facts

Published
4 Oct 2026
Last changed
5 Oct 2026
Assigned by
NetScaler
KEV added
4 Oct 2026
KEV fix due
7 Oct 2026
EPSS
11.388% likely to be exploited in the next 30 days, higher than 96.063% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.7CVSS 4.0, Highfrom the CNA (NetScaler)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What to do

  • 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 KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
NetScalerADC
  • Default status: unaffected
  • 0 up to but excluding 14.1-73.41 (affected)
  • 0 up to but excluding 13.1-64.28 (affected)
  • 0 up to but excluding 14.1-73.41 FIPS (affected)
  • 0 up to but excluding 13.1-37.282 (affected)
NetScalerGateway
  • Default status: unaffected
  • 0 up to but excluding 14.1-73.41 (affected)
  • 0 up to but excluding 13.1-64.28 (affected)

Timeline

  1. 4 Oct 2026 CVE-2026-88779 added to CISA KEV
  2. 4 Oct 2026 Added to the CISA KEV catalogue
  3. 4 Oct 2026 Published

Weakness

Related coverage

References