Linux Distros Unpatched Vulnerability : CVE-2026-52720

high Nessus Plugin ID 321144

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- 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. (CVE-2026-52720)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 321144

File Name: unpatched_CVE_2026_52720.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 6/15/2026

Updated: 6/20/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.03

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-52720

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-libs, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-devel, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:gst-plugins-bad1.0, p-cpe:/a:centos:centos:gstreamer-plugins-bad-free-devel, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-devel, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-bad-free, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-libs, p-cpe:/a:centos:centos:gstreamer-plugins-bad-free-devel-docs, p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-bad-free-devel, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-bad-free-devel-docs, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-gtk, p-cpe:/a:debian:debian_linux:gst-plugins-bad1.0, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-gtk, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:redhat:enterprise_linux:7, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:centos:centos:gstreamer-plugins-bad-free, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/15/2026

Reference Information

CVE: CVE-2026-52720

Detections

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