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CVE-2026-88776

Citrix NetScaler Gateway buffer overflow

9.8 CRITICALEPSS 0.38%
  1. Published27 Sept 2026

Description

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23  leading to unpredictable or erroneous behavior or Denial of Service

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37 · ≥ 13.1 < 13.1.37.279 · ≥ 14.1-66.68 ≤ 14.1-73.37
Citrix NetScaler Gateway≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-64.23
Citrix NetScaler Gateway≥ 13.1-64.23

References

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Frequently asked

Is CVE-2026-88776 being actively exploited?

CVE-2026-88776 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.38%.

How severe is CVE-2026-88776?

CVE-2026-88776 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.38% probability of exploitation.

Which products are affected by CVE-2026-88776?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-88776?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-64.23, Citrix NetScaler Gateway 13.1-64.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-88776 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.