CVE-2026-47876 VMXNET3 out-of-bounds write vulnerability
A local admin in a VM with VMXNET3 can execute code on the host via an out-of-bounds write, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47876?
CVE-2026-47876 is a critical memory corruption vulnerability in VMware Cloud Foundation, published on 30 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-47876?
How do I fix CVE-2026-47876?
No fix has been published for CVE-2026-47876 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-47876 being exploited?
There is no known exploitation of CVE-2026-47876 in the wild and no public exploit code.
Sources
Also known as GHSA-8f48-75j5-mrf7.