CVE-2026-88776 Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service

What is CVE-2026-88776?

CVE-2026-88776 is a high-severity memory corruption vulnerability in Citrix NetScaler ADC, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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

Weakness: CWE-119

Which versions are affected by CVE-2026-88776?

It affects 2 products.

Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.

How do I fix CVE-2026-88776?

No fix has been published for CVE-2026-88776 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-88776 being exploited?

There is no known exploitation of CVE-2026-88776 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

Other vulnerabilities in Citrix NetScaler ADC

• CVE-2023-3519 Citrix NetScaler ADC and NetScaler Gateway Code Injection Exploited Critical 9.8
• CVE-2026-88771 Citrix NetScaler Improper Input Validation Exploited Critical 9.5
• CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Exploited Critical 9.5
• CVE-2023-4966 Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Exploited Critical 9.4
• CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Exploited Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-whfq-j52q-fpq7.