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CVE-2026-25687

ZCC race condition in ZPA tunnel handler

CVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-25687

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-25687

Published

Client Connector

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Zscaler",
                    "product": "Client Connector",
                    "platforms": [
                        "Windows"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.6",
                            "lessThan": "4.6.0.486",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.7",
                            "lessThan": "4.7.0.350",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.8",
                            "lessThan": "4.8.0.267",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.9",
                            "lessThan": "4.9.0.412",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON