CVE-2026-51082: n/a
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.
AI Analysis
Technical Summary
CVE-2026-51082 is a race condition vulnerability in Proxmox Virtual Environment (PVE) affecting the vncproxy and vncwebsocket API calls. It impacts pve-manager versions before 9.1.9 (9.x) and 8.4.19 (8.x), qemu-server versions before 9.1.7 (9.x) and 8.4.7 (8.x), and pve-container versions before 6.1.3 (9.x) and 5.3.4 (8.x). The flaw allows an attacker with the ability to call the vncproxy API to hijack a VNC session established in parallel by a different user for a different VM. This vulnerability is classified under CWE-362 (Race Condition). No official patch or remediation level is provided in the available data.
Potential Impact
Successful exploitation allows an attacker with privileges to call the vncproxy API to hijack active VNC sessions of other users for different virtual machines. This compromises confidentiality, integrity, and availability of the affected VNC sessions, potentially allowing unauthorized access and control over virtual machines.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the vncproxy API to trusted users only and avoid concurrent VNC session establishment by multiple users where possible.
CVE-2026-51082: n/a
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.
CVSS v3.1
Score 7.2high
Affected software
pkg:deb/proxmox/pve-containerRun 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
CVE-2026-51082 is a race condition vulnerability in Proxmox Virtual Environment (PVE) affecting the vncproxy and vncwebsocket API calls. It impacts pve-manager versions before 9.1.9 (9.x) and 8.4.19 (8.x), qemu-server versions before 9.1.7 (9.x) and 8.4.7 (8.x), and pve-container versions before 6.1.3 (9.x) and 5.3.4 (8.x). The flaw allows an attacker with the ability to call the vncproxy API to hijack a VNC session established in parallel by a different user for a different VM. This vulnerability is classified under CWE-362 (Race Condition). No official patch or remediation level is provided in the available data.
Potential Impact
Successful exploitation allows an attacker with privileges to call the vncproxy API to hijack active VNC sessions of other users for different virtual machines. This compromises confidentiality, integrity, and availability of the affected VNC sessions, potentially allowing unauthorized access and control over virtual machines.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the vncproxy API to trusted users only and avoid concurrent VNC session establishment by multiple users where possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-07T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5b5eba2d1edb114c7fb775
Added to database: 07/18/2026, 11:08:42 UTC
Last enriched: 07/18/2026, 12:02:31 UTC
Last updated: 09/01/2026, 06:11:21 UTC
Views: 91
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