Vulnerability · Published Jul 30, 2026 · Assigned by vmware
CVE-2026-47876VMXNET3 out-of-bounds write vulnerability
Critical 9.3
In plain English
A critical-severity out-of-bounds write in Cloud Foundation from VMware. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Severity (CVSS 3.1)9.3Critical
Exploit odds (30 days)0.2%top 91.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| VMware | Cloud Foundation | 9.1.x.x9.0.x.x5.x |
| VMware | vSphere Foundation | 9.1.x.x9.0.x.x |
| VMware | ESX | 9.1.x.x – before ESXi-9.1.0.0200-255579999.0.x.x – before ESXi-9.0.2.0100-255950258.0 – before ESXi80U3k-25595708 |
| VMware | Telco Cloud Platform | 5.1.x5.0.x |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H