CVE-2026-51082
High
Description
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductProxmox Pve-manager
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-362Race condition
How to fix
Update
- Proxmox pve-manager9.1.9, 8.4.19 or later
- Proxmox qemu-server9.1.7, 8.4.7 or later
- Proxmox pve-container6.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Proxmox pve-manager | No range specified | 9.1.9, 8.4.19 |
| Proxmox qemu-server | No range specified | 9.1.7, 8.4.7 |
| Proxmox pve-container | No range specified | 6.1.3 |
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