CVE-2026-59565 Local and kernel denial-of-service
A remote buffer overflow in Zscaler Client Connector for Windows allows attackers to cause local and kernel denial-of-service conditions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-59565?
CVE-2026-59565 is a high-severity denial of service vulnerability in Zscaler Client Connector, published on 24 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.
Weakness: CWE-229
Which versions are affected by CVE-2026-59565?
How do I fix CVE-2026-59565?
No fix has been published for CVE-2026-59565 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-59565 being exploited?
There is no known exploitation of CVE-2026-59565 in the wild and no public exploit code.
Sources
Also known as GHSA-c34f-p2fw-3mjr.