CVE-2026-59347: CWE-121 Stack-based Buffer Overflow in VMware VMware Workstation
Description
VMware Workstation and Fusion contain a stack-based buffer-overflow vulnerability in HGFS. A malicious actor with local administrative privileges on a virtual machine may exploit this issue to execute code as the virtual machine's VMX process running on the host. Affected versions: - VMware Workstation: 25H2, 26H1 (fixed in 26H1u1) - VMware Fusion: 25H2, 26H1 (fixed in 26H1u1)
CVSS v3.1
Score 8.1high
Affected software
VMware
VMware Workstation
VMware
VMware Fusion
pkg:github/vmware/workstationRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a stack-based buffer overflow (CWE-121) in the HGFS component of VMware Workstation and Fusion. An attacker with local administrative access inside a guest virtual machine can exploit this flaw to execute arbitrary code as the VMX process on the host system, potentially compromising the host. The affected versions are VMware Workstation and Fusion 25H2 and 26H1. The issue is resolved in version 26H1u1 for both products. The CVSS v3.1 base score is 8.1, reflecting high impact on confidentiality, integrity, and availability, with attack vector local and requiring high attack complexity and no privileges required inside the VM.
Potential Impact
Successful exploitation allows code execution on the host system with the privileges of the VMX process, which can lead to full host compromise. The vulnerability affects confidentiality, integrity, and availability of the host system. The attacker must have local administrative privileges inside the guest VM to exploit this vulnerability.
Mitigation Recommendations
Upgrade VMware Workstation and VMware Fusion to version 26H1u1 or later, where this vulnerability is fixed. Until the update is applied, restrict local administrative access within guest virtual machines to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- vmware
- Date Reserved
- 2026-07-04T18:14:34.673Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac5e0dc2cdf04f6561c056d
Added to database: 10/07/2026, 06:04:12 UTC
Last enriched: 10/07/2026, 06:18:14 UTC
Last updated: 10/07/2026, 18:56:12 UTC
Views: 25
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