Linux Distros Unpatched Vulnerability : CVE-2026-55648

medium Nessus Plugin ID 325535

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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.

- FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon_data in libfreerdp/codec/color.c calculates nWidth multiplied by nHeight multiplied by FreeRDPGetBytesPerPixel(format) in 32-bit arithmetic. A malicious RDP server can send a RAIL TS_ICON_INFO update with dimensions such as 32768 by 32768 and 32 bits per pixel so the required-size calculation wraps, bypassing the cbBitsColor source bounds check before freerdp_image_copy_no_overlap reads attacker-controlled icon data. This affects RemoteApp clients using the vulnerable library path, while xfreerdp has a caller-side mitigation. This issue is fixed in version 3.27.0. (CVE-2026-55648)

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: Medium

ID: 325535

File Name: unpatched_CVE_2026_55648.nasl

Version: 1.8

Type: Local

Agent: unix

Family: Misc.

Published: 7/7/2026

Updated: 9/2/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.6

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

CVSS Score Source: CVE-2026-55648

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.1

Threat Score: 2.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:freerdp2, p-cpe:/a:canonical:ubuntu_linux:freerdp3, p-cpe:/a:canonical:ubuntu_linux:freerdp, p-cpe:/a:centos:centos:freerdp-devel, p-cpe:/a:centos:centos:freerdp-libs, p-cpe:/a:centos:centos:freerdp-plugins, p-cpe:/a:centos:centos:freerdp-server, p-cpe:/a:centos:centos:freerdp, p-cpe:/a:centos:centos:libwinpr-devel, p-cpe:/a:centos:centos:libwinpr, p-cpe:/a:debian:debian_linux:freerdp2, p-cpe:/a:debian:debian_linux:freerdp3, p-cpe:/a:redhat:enterprise_linux:freerdp-devel, p-cpe:/a:redhat:enterprise_linux:freerdp-libs, p-cpe:/a:redhat:enterprise_linux:freerdp-plugins, p-cpe:/a:redhat:enterprise_linux:freerdp-server, p-cpe:/a:redhat:enterprise_linux:freerdp, p-cpe:/a:redhat:enterprise_linux:libwinpr-devel, p-cpe:/a:redhat:enterprise_linux:libwinpr

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/18/2026

Reference Information

CVE: CVE-2026-55648

Detections

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