Local denial of service via buffer overflow
Published Aug 24, 2026 · Updated Aug 24, 2026
Buffer overflow in Zscaler Client Connector before 4.2 allows local users to cause denial of service on Android and ChromeOS devices. Zscaler identifies a locally exploitable buffer overflow but has not published the affected component, input path, or faulty memory operation. Local endpoint access is required, and the public record does not state whether denial of service means a client hang, process crash, or device interruption.
Summary
What happened
Buffer overflow in Zscaler Client Connector before 4.2 allows local users to cause denial of service on Android and ChromeOS devices. Zscaler identifies a locally exploitable buffer overflow but has not published the affected component, input path, or faulty memory operation. Local endpoint access is required, and the public record does not state whether denial of service means a client hang, process crash, or device interruption.
The record
- CVE
- CVE-2026-59566
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Vendor
- Zscaler
- Product
- Zscaler Client Connector
- Classifications
- CWE-229, T1642
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 24, 2026CVE publishedPublication date reported by the CVE source.
- Aug 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <Android: 4.2
- Affected versionversion=0 <ChromeOS: 4.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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