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Vulnerabilities CVE-2025-11234

CVE-2025-11234

High
Open
TLP:CLEAR

Qemu-kvm: vnc websocket handshake use-after-free

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Description

A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by a malicious client with network access to the VNC WebSocket port to cause a denial of service during the WebSocket handshake prior to the VNC client authentication.

Details

CVSS Score
7.5
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Oct 3, 2025
Last Modified
Aug 21, 2026
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