CVE-2026-59565: CWE-229 Improper handling of values in Zscaler Client Connector
Description
CVE-2026-59565 is a high-severity vulnerability in Zscaler Client Connector for Windows involving improper handling of values that leads to a remotely exploitable buffer overflow. This flaw can cause denial-of-service conditions at both the local user and kernel levels. No specific affected versions or patches have been disclosed yet.
CVSS v3.1
Score 8.8high
Affected software
Zscaler
Client Connector
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-229, involves improper handling of values in Zscaler Client Connector on Windows, resulting in a buffer overflow that can be exploited remotely to cause denial-of-service attacks affecting local and kernel operations. The CVSS 3.1 score is 8.8, indicating high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation can cause denial-of-service conditions locally and at the kernel level on affected Windows systems running Zscaler Client Connector. This impacts system availability and potentially compromises system stability. There is no evidence of confidentiality or integrity breaches beyond the denial-of-service effect.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor official Zscaler communications for updates and apply any recommended temporary mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Zscaler
- Date Reserved
- 2026-07-06T06:18:59.633Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8c504bacd9273b49a2280e
Added to database: 08/24/2026, 14:08:11 UTC
Last enriched: 09/10/2026, 10:52:11 UTC
Last updated: 10/08/2026, 18:48:47 UTC
Views: 53
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