CVE-2026-88779 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer
A memory overflow in NetScaler ADC and Gateway allows attackers to cause a denial of service, requiring an upgrade to patched versions.
- Exploited in the wild
- Since 4 Oct 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88779?
CVE-2026-88779 is a high-severity memory corruption vulnerability in NetScaler ADC, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-119
Which versions are affected by CVE-2026-88779?
It affects 2 products.
Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.
How do I fix CVE-2026-88779?
No fix has been published for CVE-2026-88779 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 7 Oct 2026.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-88779 being exploited?
Yes. Attackers have exploited CVE-2026-88779 in the wild since at least 4 Oct 2026.
Other vulnerabilities in NetScaler ADC
- CVE-2023-3519 Citrix NetScaler ADC and NetScaler Gateway Code Injection
- CVE-2026-88771 Citrix NetScaler Improper Input Validation
- CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer
- CVE-2023-4966 Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow
- CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel
Sources
Also known as GHSA-56r3-m27m-8p62.