SB2026073027 - Out-of-bounds write in VMware ESXi
Published: July 30, 2026
Security Bulletin ID
SB2026073027
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-47876)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:U/U:Green
The vulnerability allows a malicious privileged guest to compromise the vulnerable system.
The vulnerability exists due to a boundary error in the VMXNET3 virtual network adapter. A privileged user on a guest OS can trigger an out-of-bounds write and execute arbitrary code on the host OS.
Note, non VMXNET3 virtual adapters are not affected by this vulnerability.
Remediation
Install update from vendor's website.