CVE-2026-52720
Awaiting Analysis Awaiting Analysis - Queue
BaseFortify

Publication date: 2026-06-15

Last updated on: 2026-06-15

Assigner: Red Hat, Inc.

Description
A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-06-15
Last Modified
2026-06-15
Generated
2026-06-16
AI Q&A
2026-06-16
EPSS Evaluated
N/A
NVD
CVE-2026-52720
EUVD
EUVD-2026-36803
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
gstreamer gstreamer 1.28.4
gstreamer gst-plugins-bad *
gstreamer librfb *
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

CVE-2026-52720 is a heap buffer overflow vulnerability found in the GStreamer library's librfb component, which handles VNC (Virtual Network Computing) connections.

The vulnerability arises because the rectangle bounds check incorrectly validates the combined area of width and height rather than checking each dimension individually. This flaw allows a malicious VNC server to send rectangle parameters that extend beyond the actual framebuffer dimensions.

When a user connects to such a malicious server, the flawed validation can cause an out-of-bounds heap write during a memory copy operation, potentially leading to a crash or remote code execution.

Impact Analysis

This vulnerability can impact you if you use the GStreamer librfb component to connect to VNC servers.

A remote attacker controlling a malicious VNC server could exploit this flaw to cause your application to crash or execute arbitrary code on your system.

This could lead to unauthorized access, data compromise, or disruption of services on your device.

Detection Guidance

This vulnerability occurs when a user connects to a malicious or improperly configured VNC/RFB server that sends crafted rectangle parameters exceeding framebuffer dimensions. Detection involves monitoring VNC client connections for unusual or suspicious rectangle parameters such as width or height values exceeding the framebuffer size.

Since the vulnerability is triggered by specific malformed rectangle data in VNC traffic, network detection could involve inspecting VNC protocol traffic for abnormal rectangle dimensions.

No explicit detection commands are provided in the available resources.

Mitigation Strategies

Immediate mitigation involves avoiding connections to untrusted or unknown VNC servers, as the vulnerability is exploited by connecting to a malicious VNC server.

Updating the GStreamer library to version 1.28.4 or later, where the fix for this vulnerability is planned, is recommended once available.

Until the patch is applied, restricting or monitoring VNC client usage and network traffic to prevent connections to potentially malicious servers can reduce risk.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-52720. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart