ZscalerCVE-2026-25687
Zscaler Client Connector: race condition
High8.1CVE-2026-25687 · Published Sep 14, 2026 · updated Sep 18, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Client Connector Product | >= 4.6, < 4.6.0.486 | 4.6.0.486 |
| >= 4.7, < 4.7.0.350 | 4.7.0.350 | |
| >= 4.8, < 4.8.0.267 | 4.8.0.267 | |
| >= 4.9, < 4.9.0.412 | 4.9.0.412 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-366
More Zscaler advisories
All Zscaler| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 18 | Zscaler: improper input validation | Medium4.4 | No fix yet |
| Sep 14 | Zscaler Client Connector: improper input validation | High8.1 | Android: 4.2.0.152+1 more |
| Sep 14 | Zscaler Client Connector: improper input validation | High7.5 | Android: 4.2.0.152+1 more |
| Aug 24 | Zscaler Client Connector: privilege escalation | High8.8 | Windows: 4.6.0.457+8 more |
| Aug 24 | Zscaler Client Connector: remote code execution | Critical9.1 | Windows: 4.6.0.457+8 more |
| Aug 24 | Zscaler Client Connector: authentication bypass | Critical9.1 | Windows: 4.6.0.457+7 more |