OOB Heap Read in libXfont2 query glyphs (CVE-2026-59679)
CVE-2026-59679 Published on September 10, 2026

fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2
fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked. A malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes.

NVD

Vulnerability Analysis

CVE-2026-59679 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:

NETWORK

Attack Complexity:

HIGH

Privileges Required:

NONE

User Interaction:

NONE

Scope:

CHANGED

Confidentiality Impact:

HIGH

Integrity Impact:

HIGH

Availability Impact:

HIGH

Products Associated with CVE-2026-59679

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Suse Linux Enterprise Desktop

Suse Linux Enterprise

Suse Linux Enterprise Server

Suse Manager

Affected Versions

Container suse/kiosk/tigervnc-x11vnc:1.14-63.8:

Version ? and below 2.0.3-150000.3.6.1 is affected.

Container suse/kiosk/xorg:21.1-83.7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Azure-3P:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-BYOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-BYOS-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-BYOS-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-BYOS-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-BYOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-BYOS-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-BYOS-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-BYOS-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAP-Hardened-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAPCAL:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAPCAL-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAPCAL-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP6-SAPCAL-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Azure-3P:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-BYOS-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-BYOS-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-BYOS-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-GCE-3P:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Hardened-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Hardened-BYOS-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Hardened-BYOS-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Hardened-BYOS-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAP-Hardened-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAPCAL-Azure:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAPCAL-EC2:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES15-SP7-SAPCAL-GCE:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Image SLES-SAP-Azure:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-Azure-3P:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-BYOS-Azure:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-BYOS-EC2:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-BYOS-GCE:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-GCE:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAP-GCE-3P:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES-SAPCAL-GCE:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Image SLES12-SP5-Azure-SAP-BYOS:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Image SLES12-SP5-Azure-SAP-On-Demand:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Image SLES12-SP5-EC2-SAP-BYOS:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Image SLES12-SP5-EC2-SAP-On-Demand:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Image SLES12-SP5-GCE-SAP-BYOS:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Image SLES12-SP5-GCE-SAP-On-Demand:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Liberty Linux 10:

Version ? and below 2.0.6-5.el10_2.3 is affected.

SUSE Liberty Linux 10:

Version ? and below 2.0.6-5.el10_2.3 is affected.

SUSE Liberty Linux 8:

Version ? and below 2.0.3-2.el8_10.3 is affected.

SUSE Liberty Linux 8:

Version ? and below 2.0.3-2.el8_10.3 is affected.

SUSE Liberty Linux 9:

Version ? and below 2.0.3-12.el9_8.3 is affected.

SUSE Liberty Linux 9:

Version ? and below 2.0.3-12.el9_8.3 is affected.

SUSE Linux Enterprise Desktop 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Desktop 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Module for Basesystem 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Module for Basesystem 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP7:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 12 SP5-LTSS:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP4-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP4-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP5-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP5-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP6-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 15 SP6-LTSS:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Linux Enterprise Server 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Linux Enterprise Server for SAP applications 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Linux Enterprise Server for SAP applications 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:

Version ? and below 2.0.3-3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP4:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP4:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP5:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP5:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP6:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Linux Enterprise Server for SAP Applications 15 SP6:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Proxy LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Proxy LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Retail Branch Server LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Retail Branch Server LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Server LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

SUSE Manager Server LTS 4.3:

Version ? and below 2.0.3-150000.3.6.1 is affected.

openSUSE Leap 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

openSUSE Leap 16.0:

Version ? and below 2.0.7-160000.5.1 is affected.

openSUSE Tumbleweed:

Version ? and below 2.0.7-3.1 is affected.

openSUSE Tumbleweed:

Version ? and below 2.0.7-3.1 is affected.

openSUSE Tumbleweed:

Version ? and below 2.0.7-3.1 is affected.

openSUSE Tumbleweed:

Version ? and below 2.0.7-3.1 is affected.

libXfont2:

Version ?, <= 2.0.8 is affected.

OOB Heap Read in libXfont2 query glyphs (CVE-2026-59679)CVE-2026-59679 Published on September 10, 2026

Vulnerability Analysis

Products Associated with CVE-2026-59679

Affected Versions

OOB Heap Read in libXfont2 query glyphs (CVE-2026-59679)
CVE-2026-59679 Published on September 10, 2026