What’s Vulnerable › Vulnerabilities
CVE-2026-47876: VMXNET3 out-of-bounds write vulnerability
- Severity: critical (CVSS 9.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-30 · updated 2026-07-30
- Weakness: CWE-787
Description
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.
Affected products
- VMware Cloud Foundation: 9.1.x.x, 9.0.x.x, 5.x
- VMware ESX: from 9.1.x.x before ESXi-9.1.0.0200-25557999; from 9.0.x.x before ESXi-9.0.2.0100-25595025; from 8.0 before ESXi80U3k-25595708 — fixed in ESXi-9.0.2.0100-25595025, ESXi-9.1.0.0200-25557999, ESXi80U3k-25595708
- VMware Telco Cloud Platform: 5.1.x, 5.0.x
- VMware vSphere Foundation: 9.1.x.x, 9.0.x.x
How to fix
Upgrade to a fixed version: VMware ESX ESXi-9.0.2.0100-25595025, ESXi-9.1.0.0200-25557999, ESXi80U3k-25595708. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-47876 or the next vulnerability affects your stack