CVE-2026-25687

ZCC race condition in ZPA tunnel handler

State: Published
Severity: 8.1 High
Published: Sep 14, 2026
Updated: Sep 15, 2026
Reserved: Feb 5, 2026

Description

A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	Zscaler

Weaknesses

CWE-366 Race condition within a thread

Affected Products

Product	Versions
Client ConnectorZscaler	4.6 to before 4.6.0.486Affected 4.7 to before 4.7.0.350Affected 4.8 to before 4.8.0.267Affected 4.9 to before 4.9.0.412Affected

References

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

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