Critical severity · published Jul 30, 2026
CVE-2026-47876
VMXNET3 out-of-bounds write vulnerability
9.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CF
Cloud Foundation · VMware
9.1.x.x; 9.0.x.x; 5.x · source: vendor
ES
ESX · VMware
9.1.x.x before ESXi-9.1.0.0200-25557999; 9.0.x.x before ESXi-9.0.2.0100-25595025; 8.0 before ESXi80U3k-25595708 · source: vendor
TC
Telco Cloud Platform · VMware
5.1.x; 5.0.x · source: vendor
VF
vSphere Foundation · VMware
9.1.x.x; 9.0.x.x · source: vendor
In the news
VulnerabilityCritical
Broadcom Patches Critical VMware ESXi Vulnerability Enabling Host Code Execution
Broadcom patched a critical VMware ESXi VM escape flaw (CVE-2026-47876) that could let attackers run code on the host from a compromised virtual machine. Broadcom has released patches to address five vulnerabilities affecting VMware ESXi, vCenter, Workstation, and Fusion, including three rated critical. The most severe, tracked as CVE-2026-47876 (CVSSv3 base score of 9.3), is a […]
Jul 29, 2026·Security Affairs
VulnerabilityHigh
ZDI-26-495: (Pwn2Own) VMware ESXi VMXNET3 espQueueMask Out-Of-Bounds Write Local Privilege Escalation Vulnerability
This vulnerability allows local attackers to escalate privileges on affected installations of VMware ESXi. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.2. The following CVEs are assigned: CVE-2026-47876.
Jul 29, 2026·Zero Day Initiative
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47876
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47876
support.broadcom.com
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/38017
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