Loading vulnerability…
CVE-2026-47876 is a critical out-of-bounds write vulnerability in the VMXNET3 virtual network adapter implementation used by VMware ESX/ESXi. The flaw is a memory corruption issue in the hypervisor-side handling of VMXNET3 traffic or device interaction, allowing writes beyond intended memory bounds. A malicious actor who has already obtained local administrative privileges inside a guest virtual machine configured with the VMXNET3 virtual network adapter can exploit the vulnerability to execute code on the underlying ESX host. Because the flaw crosses the guest-to-host isolation boundary, it is classified as a virtual machine escape. Systems using virtual network adapters other than VMXNET3 are not affected by this specific issue.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
62 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical vulnerability affecting the VMXNET3 virtual network adapter in ESXi that could allow code execution on the underlying host by a malicious virtual-machine user.
A critical vulnerability affecting the VMXNET3 virtual network adapter in ESXi that could allow code execution on the underlying host by a malicious virtual-machine user.
A specific VMware vulnerability affecting multiple VMware products, with fixed ESXi builds and KB references provided.
A VMware virtualization component vulnerability that may enable code execution under specific conditions and could affect guest-to-host isolation assumptions.
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.