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CVE-2026-47876 is a critical out-of-bounds write vulnerability in VMware ESX/ESXi involving the VMXNET3 virtual network adapter. The flaw affects guest virtual machines configured to use the VMXNET3 adapter and can be triggered by an attacker who already has local administrative privileges inside the guest. Successful exploitation breaks isolation between the guest and host, enabling a VM escape from the virtual machine context into code execution on the underlying ESX host. The issue is described as residing on the ESX side rather than in VMware Tools.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical out-of-bounds write VM escape vulnerability in the VMXNET3 virtual network adapter in VMware ESXi that could allow code execution on the host from a compromised virtual machine.
A critical out-of-bounds write vulnerability in VMware ESXi's VMXNET3 virtual network adapter that can enable VM escape and arbitrary code execution on the host from a guest VM with local admin privileges.
A critical out-of-bounds write vulnerability in the VMXNET3 virtual network adapter that may allow a guest-to-host escape and code execution on the ESXi host from a VM with local administrative access.
A VMware ESX vulnerability that allows a local administrator in a virtual machine using the VMXNET3 virtual network adapter to execute code on the ESX host platform.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.