CVE-2026-59565 PUBLISHED

Local and kernel denial-of-service

Assigner: Zscaler
Reserved: 06.07.2026 Published: 24.08.2026 Updated: 24.08.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Zscaler
Product	Client Connector
Versions	Default: affected affected from 0 to Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 (excl.)

References

https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026

Problem Types

CWE-229 Improper handling of values CWE

Impacts

CAPEC-100 Overflow Buffers