High SEVERITY — Vulnerability

CVE-2026-51082 — A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager be

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.

Platform
Proxmox VE
CVE Record
CVE-2026-51082
CVSS Score
7.2/10
Published
17 July 2026
Views
3
Primary source: Review the official advisory at nvd.nist.gov Kaynağa Git

Summary

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.

Assessment

  • CVE: CVE-2026-51082
  • CVSS base score: 7.2
  • Vector: CVSS:3.1\/AV:N\/AC:L\/PR:H\/UI:N\/S:U\/C:H\/I:H\/A:H
  • Source: [NVD entry](https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-51082)

References

  • [forum.proxmox.com](https:\/\/forum.proxmox.com\/threads\/proxmox-virtual-environment-security-advisories.149331\/post-849971)

Actions

  • Verify affected systems in your inventory
  • Apply the vendor patch during a maintenance window
  • Restrict access at the network layer until the patch is applied

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