CVE-2026-19489 Memory corruption in ADC

High 8.8 Published 19 Aug 2026 Updated 20 Aug 2026

A buffer overflow in NetScaler ADC and Gateway allows attackers to execute arbitrary code or cause denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-19489?

CVE-2026-19489 is a high-severity memory corruption vulnerability in NetScaler ADC, published on 19 Aug 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: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

Weakness: CWE-120

Which versions are affected by CVE-2026-19489?

How do I fix CVE-2026-19489?

No fix has been published for CVE-2026-19489 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-2026-19489 being exploited?

There is no known exploitation of CVE-2026-19489 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-8jq9-gg9v-58rv.