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9.0 Critical

CVE-2026-44950 fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer

Description

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.

Affected products and versions

Product Affected versions Fixed in
Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Container suse/kiosk/xorg:21.1-83.7 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Azure-3P 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-BYOS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-BYOS-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-BYOS-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-BYOS-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Show the 71 other branches
Product Affected versions Fixed in
Image SLES15-SP6-SAP-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-BYOS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-BYOS-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-BYOS-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-BYOS-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAP-Hardened-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAPCAL 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAPCAL-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAPCAL-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP6-SAPCAL-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Azure-3P 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-BYOS-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-BYOS-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-BYOS-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-GCE-3P 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Hardened-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Hardened-BYOS-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Hardened-BYOS-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Hardened-BYOS-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAP-Hardened-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAPCAL-Azure 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAPCAL-EC2 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES15-SP7-SAPCAL-GCE 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
Image SLES-SAP-Azure 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-Azure-3P 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-BYOS-Azure 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-BYOS-EC2 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-BYOS-GCE 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-GCE 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAP-GCE-3P 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES-SAPCAL-GCE 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
Image SLES12-SP5-Azure-SAP-BYOS 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
Image SLES12-SP5-Azure-SAP-On-Demand 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
Image SLES12-SP5-EC2-SAP-BYOS 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
Image SLES12-SP5-EC2-SAP-On-Demand 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
Image SLES12-SP5-GCE-SAP-BYOS 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
Image SLES12-SP5-GCE-SAP-On-Demand 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
SUSE Liberty Linux 10 Versions not published
SUSE Liberty Linux 8 Versions not published
SUSE Liberty Linux 9 Versions not published
SUSE Linux Enterprise Desktop 15 SP7 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Module for Basesystem 15 SP7 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server 15 SP7 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server 12 SP5-LTSS 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
SUSE Linux Enterprise Server 15 SP4-LTSS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server 15 SP5-LTSS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server 15 SP6-LTSS 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server 16.0 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
SUSE Linux Enterprise Server for SAP applications 16.0 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 2.0 earliest → < 2.0.3-3.6.1 2.0.3-3.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP4 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP5 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP6 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Manager Proxy LTS 4.3 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Manager Retail Branch Server LTS 4.3 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
SUSE Manager Server LTS 4.3 2.0 earliest → < 2.0.3-150000.3.6.1 2.0.3-150000.3.6.1
openSUSE Leap 16.0 2.0 earliest → < 2.0.7-160000.5.1 2.0.7-160000.5.1
openSUSE Tumbleweed 2.0 earliest → < 2.0.7-3.1 2.0.7-3.1
libXfont 2.0 earliest → 2.0.8 No fix stated

Other CVEs of Container suse/kiosk/tigervnc-x11vnc:1.14-63.8

The 2 CVEs of Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 →
CVE-2026-59679 fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array… 9.0 Critical
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