CVE-2026-47876
CriticalCVSS 9.3Summary
VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious actor with local administrative privileges on a virtual machine with VMXNET3 virtual network adapter may exploit this issue to execute code on the host.
Risk Assessment
The risk is the potential for privilege escalation from a virtual machine to the host, which could lead to full compromise of the virtualization environment.
Recommendation
It is recommended to immediately update VMware ESX to a patched version and minimize the use of VMXNET3 adapters where possible.
Other vulnerabilities in VMware ESX
See all- CVE-2026-41703High
VMware ESX, Workstation, and Fusion contain an out-of-bounds read vulnerability. A user with VM deployment privileges can trigger an out-of-bounds read, potentially leading to information disclosure or a Denial-of-Service (DoS) condition of the host process. On Workstation and Fusion, the impact is restricted to information disclosure.
- CVE-2026-41709LowActively exploited
VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exploit this issue to perform certain operations without them being logged.
Original NVD description (English source)
VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious actor with local administrative privileges on a virtual machine with VMXNET3 virtual network adapter may exploit this issue to execute code on the host. Non VMXNET3 virtual adapters are not affected by this issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS