CVE-2026-47876: 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 VM

criticalCVSS 9.3CVE-2026-47876

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.3
Published: 2026-07-30
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-47876

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-478760.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47876	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] VMware Products: Multiple vulnerabilitiescert-bund
unknownVMware security advisory (AV26-763)cccs
unknownMultiple Vulnerabilities in VMware Products (July 30, 2026)cert-fr-avis
unknownNCSC-2026-0269 [1.01] [M/H] Vulnerabilities fixed in VMware productsncsc-nl

Recent advisories for VMware ESX contains

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

lowCVE-2026-41709: VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exp…nvd · 2026-07-30
highCVE-2026-41703: VMware ESX, Workstation, and Fusion contain an out-of-bounds read vulnerability. A malicious a…nvd · 2026-07-30