🔐 CVE Alert

CVE-2026-59679

CRITICAL 9.0

fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2

CVSS Score
9.0
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor suse
Product container suse/kiosk/tigervnc-x11vnc:1.14-63.8
Published Sep 10, 2026
Last Updated Sep 10, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Affected Versions

SUSE / Container suse/kiosk/tigervnc-x11vnc:1.14-63.8
? < 2.0.3-150000.3.6.1
SUSE / Container suse/kiosk/xorg:21.1-83.7
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Azure-3P
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-BYOS
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-BYOS-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-BYOS-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-BYOS-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-BYOS
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-BYOS-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-BYOS-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-BYOS-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAP-Hardened-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAPCAL
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAPCAL-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAPCAL-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP6-SAPCAL-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Azure-3P
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-BYOS-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-BYOS-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-BYOS-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-GCE-3P
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Hardened-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Hardened-BYOS-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Hardened-BYOS-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Hardened-BYOS-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAP-Hardened-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAPCAL-Azure
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAPCAL-EC2
? < 2.0.3-150000.3.6.1
SUSE / Image SLES15-SP7-SAPCAL-GCE
? < 2.0.3-150000.3.6.1
SUSE / Image SLES-SAP-Azure
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-Azure-3P
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-BYOS-Azure
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-BYOS-EC2
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-BYOS-GCE
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-GCE
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAP-GCE-3P
? < 2.0.7-160000.5.1
SUSE / Image SLES-SAPCAL-GCE
? < 2.0.7-160000.5.1
SUSE / Image SLES12-SP5-Azure-SAP-BYOS
? < 2.0.3-3.6.1
SUSE / Image SLES12-SP5-Azure-SAP-On-Demand
? < 2.0.3-3.6.1
SUSE / Image SLES12-SP5-EC2-SAP-BYOS
? < 2.0.3-3.6.1
SUSE / Image SLES12-SP5-EC2-SAP-On-Demand
? < 2.0.3-3.6.1
SUSE / Image SLES12-SP5-GCE-SAP-BYOS
? < 2.0.3-3.6.1
SUSE / Image SLES12-SP5-GCE-SAP-On-Demand
? < 2.0.3-3.6.1
SUSE / SUSE Liberty Linux 10
? < 2.0.6-5.el10_2.3
SUSE / SUSE Liberty Linux 10
? < 2.0.6-5.el10_2.3
SUSE / SUSE Liberty Linux 8
? < 2.0.3-2.el8_10.3
SUSE / SUSE Liberty Linux 8
? < 2.0.3-2.el8_10.3
SUSE / SUSE Liberty Linux 9
? < 2.0.3-12.el9_8.3
SUSE / SUSE Liberty Linux 9
? < 2.0.3-12.el9_8.3
SUSE / SUSE Linux Enterprise Desktop 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Desktop 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Module for Basesystem 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Module for Basesystem 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP7
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 12 SP5-LTSS
? < 2.0.3-3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP4-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP4-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP5-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP5-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP6-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 15 SP6-LTSS
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server 16.0
? < 2.0.7-160000.5.1
SUSE / SUSE Linux Enterprise Server 16.0
? < 2.0.7-160000.5.1
SUSE / SUSE Linux Enterprise Server for SAP applications 16.0
? < 2.0.7-160000.5.1
SUSE / SUSE Linux Enterprise Server for SAP applications 16.0
? < 2.0.7-160000.5.1
SUSE / SUSE Linux Enterprise Server LTSS Extended Security 12 SP5
? < 2.0.3-3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP4
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP4
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP5
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP5
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP6
? < 2.0.3-150000.3.6.1
SUSE / SUSE Linux Enterprise Server for SAP Applications 15 SP6
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Proxy LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Proxy LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Retail Branch Server LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Retail Branch Server LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Server LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / SUSE Manager Server LTS 4.3
? < 2.0.3-150000.3.6.1
SUSE / openSUSE Leap 16.0
? < 2.0.7-160000.5.1
SUSE / openSUSE Leap 16.0
? < 2.0.7-160000.5.1
SUSE / openSUSE Tumbleweed
? < 2.0.7-3.1
SUSE / openSUSE Tumbleweed
? < 2.0.7-3.1
SUSE / openSUSE Tumbleweed
? < 2.0.7-3.1
SUSE / openSUSE Tumbleweed
? < 2.0.7-3.1
libXfont2 / libXfont2
? ≤ 2.0.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.suse.com: https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679

Credits

zx (Jace)