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Critical Vulnerabilities Patched in VMware Workstation and Fusion Allowing Host Code Execution

Broadcom has disclosed two vulnerabilities in VMware Workstation and VMware Fusion rated as critical and important respectively. CVE-2026-59346 is an integer overflow flaw in the VMXNET3 virtual network adapter that can be exploited by a local administrator inside a virtual machine to execute arbitrary code on the host system, carrying a CVSS v3.1 base score of 9.3. CVE-2026-59347 is a stack-based buffer overflow in the HGFS file system that permits code execution on the host as the VMX process with a CVSS score of 8.1. Both issues were privately reported and affect users who run virtual machines with local administrative privileges. The flaws have been addressed in VMware Workstation 26H1u1 and VMware Fusion 26H1u1, and Broadcom urges immediate updates via advisory VMSA-2026-0007.

Security NEXTTranslated from Japanese

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Broadcom has published a security advisory detailing multiple vulnerabilities in VMware Workstation and VMware Fusion, classifying the most severe issue as Critical.

The advisory, released on September 3, 2026, covers two privately reported flaws: CVE-2026-59346 and CVE-2026-59347. Both can be exploited when an attacker already possesses local administrator rights inside a guest virtual machine, allowing code execution on the underlying host.

CVE-2026-59346 affects the VMXNET3 virtual network adapter and involves an integer overflow condition. Successful exploitation grants the attacker the ability to run arbitrary code directly on the host operating system. The vulnerability received a CVSS v3.1 base score of 9.3, placing it in the highest severity tier of Critical.

The second issue, CVE-2026-59347, resides in the HGFS shared-folder implementation and is a stack-based buffer overflow. Exploitation allows code execution on the host under the context of the VMX process. It carries a CVSS base score of 8.1 and is rated Important.

Broadcom has released fixes in VMware Workstation 26H1u1 and VMware Fusion 26H1u1. Organizations and individual users are strongly encouraged to apply the updates without delay to eliminate the risk of host compromise from within guest environments.

VMware WorkstationVMXNET3VMware FusionCVE-2026-59346CVE-2026-59347HGFS
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