Upstream information

CVE-2026-44988 at MITRE

Description

LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 8.8 8.1
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network Network
Attack Complexity Low High
Privileges Required None None
User Interaction Required None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail SUSE
Base Score 9.2
Vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Attack Vector Network
Attack Complexity High
Attack Requirements Present
Privileges Required None
User Interaction None
Vulnerable System Confidentiality Impact High
Vulnerable System Integrity Impact High
Vulnerable System Availability Impact High
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1266459 [NEW]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 LibVNCServer Affected
SUSE Linux Enterprise Server 15 SP7 LibVNCServer Affected
SUSE Linux Enterprise Server 16.0 LibVNCServer Affected
SUSE Linux Enterprise Server 16.1 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP applications 16.0 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP applications 16.1 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 SP7 LibVNCServer Affected
openSUSE Leap 16.0 LibVNCServer Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Server 12 SP5 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP5-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security LibVNCServer Affected
SUSE Linux Enterprise Server 15 SP6 LibVNCServer Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 LibVNCServer Affected
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 LibVNCServer Affected
SUSE Linux Enterprise Desktop 12 LibVNCServer Affected
SUSE Linux Enterprise Desktop 12 SP1 LibVNCServer Affected
SUSE Linux Enterprise Desktop 12 SP2 LibVNCServer Affected
SUSE Linux Enterprise Desktop 12 SP3 LibVNCServer Affected
SUSE Linux Enterprise Desktop 12 SP4 LibVNCServer Affected
SUSE Linux Enterprise Desktop 15 LibVNCServer Affected
SUSE Linux Enterprise Desktop 15 SP1 LibVNCServer Affected
SUSE Linux Enterprise Desktop 15 SP2 LibVNCServer Affected
SUSE Linux Enterprise Desktop 15 SP3 LibVNCServer Affected
SUSE Linux Enterprise Desktop 15 SP6 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP1 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP2 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP3 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP5 LibVNCServer Affected
SUSE Linux Enterprise Module for Package Hub 15 SP6 LibVNCServer Affected
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT LibVNCServer Affected
SUSE Linux Enterprise Server 12 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP1 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP1-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP2 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP2-BCL LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP2-ESPOS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP2-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP3 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP3-BCL LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP3-ESPOS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP3-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP4 LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP4-ESPOS LibVNCServer Affected
SUSE Linux Enterprise Server 12 SP4-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 12-LTSS LibVNCServer Affected
SUSE Linux Enterprise Server 15 LibVNCServer Affected
SUSE Linux Enterprise Server 15 SP1 LibVNCServer Affected
SUSE Linux Enterprise Server 15 SP2 LibVNCServer Affected
SUSE Linux Enterprise Server 15 SP3 LibVNCServer Affected
SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP1 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 LibVNCServer Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 SP1 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 SP2 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 SP3 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 SP4 LibVNCServer Affected
SUSE Linux Enterprise Software Development Kit 12 SP5 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 SP1 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 SP2 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 SP3 LibVNCServer Affected
SUSE Linux Enterprise Workstation Extension 15 SP6 LibVNCServer Affected
SUSE OpenStack Cloud 7 LibVNCServer Affected
SUSE OpenStack Cloud 8 LibVNCServer Affected
SUSE OpenStack Cloud 9 LibVNCServer Affected
SUSE OpenStack Cloud Crowbar 8 LibVNCServer Affected
SUSE OpenStack Cloud Crowbar 9 LibVNCServer Affected
openSUSE Leap 15.3 LibVNCServer Affected
openSUSE Leap 15.6 LibVNCServer Affected


SUSE Timeline for this CVE

CVE page created: Wed May 27 18:04:00 2026
CVE page last modified: Wed May 27 21:29:13 2026