CVE-2026-44950
fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow 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) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation. A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.
| 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
libXfont / libXfont
? ≤ 2.0.8
References
Credits
zx (Jace)