A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.

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Fixes

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History

Fri, 31 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Title Race Condition Enables VNC Session Hijacking in Proxmox Virtual Environment

Thu, 30 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Proxmox
Proxmox pve-container
Proxmox pve-manager
Qemu
Qemu qemu
Vendors & Products Proxmox
Proxmox pve-container
Proxmox pve-manager
Qemu
Qemu qemu

Tue, 28 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Title Race Condition Allows VNC Session Hijacking in Proxmox Virtual Environment

Wed, 22 Jul 2026 04:15:00 +0000

Type Values Removed Values Added
Title Race Condition Allows VNC Session Hijacking in Proxmox Virtual Environment

Fri, 17 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 17 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Description A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager 9.1.x before 9.1.9 and 8.4.x before 8.4.19; qemu-server 9.1.x before 9.1.7 and 8.4.x before 8.4.7; and pve-container 6.1.x before 6.1.3 and 5.3.x before 5.3.4 allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM. A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.

Fri, 17 Jul 2026 15:00:00 +0000

Type Values Removed Values Added
Description A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager 9.1.x before 9.1.9 and 8.4.x before 8.4.19; qemu-server 9.1.x before 9.1.7 and 8.4.x before 8.4.7; and pve-container 6.1.x before 6.1.3 and 5.3.x before 5.3.4 allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-17T16:44:44.740Z

Reserved: 2026-06-07T00:00:00.000Z

Link: CVE-2026-51082

cve-icon Vulnrichment

Updated: 2026-07-17T16:44:40.348Z

cve-icon NVD

Status : Deferred

Published: 2026-07-17T15:16:46.867

Modified: 2026-07-17T18:28:39.220

Link: CVE-2026-51082

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T01:00:14Z

Weaknesses