CVE-2026-59679
Fixed in a distro release EPSS <1%CVSS 9.0
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.
Products: Container suse/kiosk/tigervnc-x11vnc:1.14-63.8, Container suse/kiosk/xorg:21.1-83.7, SUSE Image SLES15-SP6-SAP, SUSE Image SLES15-SP6-SAP-Azure, SUSE Image SLES15-SP6-SAP-Azure-3P, SUSE Image SLES15-SP6-SAP-BYOS, SUSE Image SLES15-SP6-SAP-BYOS-Azure, SUSE Image SLES15-SP6-SAP-BYOS-EC2, SUSE Image SLES15-SP6-SAP-BYOS-GCE, SUSE Image SLES15-SP6-SAP-EC2, SUSE Image SLES15-SP6-SAP-GCE, SUSE Image SLES15-SP6-SAP-Hardened, SUSE Image SLES15-SP6-SAP-Hardened-Azure, SUSE Image SLES15-SP6-SAP-Hardened-BYOS, SUSE Image SLES15-SP6-SAP-Hardened-BYOS-Azure, SUSE Image SLES15-SP6-SAP-Hardened-BYOS-EC2, SUSE Image SLES15-SP6-SAP-Hardened-BYOS-GCE, SUSE Image SLES15-SP6-SAP-Hardened-EC2, SUSE Image SLES15-SP6-SAP-Hardened-GCE, SUSE Image SLES15-SP6-SAPCAL, SUSE Image SLES15-SP6-SAPCAL-Azure, SUSE Image SLES15-SP6-SAPCAL-EC2, SUSE Image SLES15-SP6-SAPCAL-GCE, SUSE Image SLES15-SP7-SAP-Azure, SUSE Image SLES15-SP7-SAP-Azure-3P, SUSE Image SLES15-SP7-SAP-BYOS-Azure, SUSE Image SLES15-SP7-SAP-BYOS-EC2, SUSE Image SLES15-SP7-SAP-BYOS-GCE, SUSE Image SLES15-SP7-SAP-EC2, SUSE Image SLES15-SP7-SAP-GCE, SUSE Image SLES15-SP7-SAP-GCE-3P, SUSE Image SLES15-SP7-SAP-Hardened-Azure, SUSE Image SLES15-SP7-SAP-Hardened-BYOS-Azure, SUSE Image SLES15-SP7-SAP-Hardened-BYOS-EC2, SUSE Image SLES15-SP7-SAP-Hardened-BYOS-GCE, SUSE Image SLES15-SP7-SAP-Hardened-GCE, SUSE Image SLES15-SP7-SAPCAL-Azure, SUSE Image SLES15-SP7-SAPCAL-EC2, SUSE Image SLES15-SP7-SAPCAL-GCE, SUSE Image SLES-SAP-Azure, SUSE Image SLES-SAP-Azure-3P, SUSE Image SLES-SAP-BYOS-Azure, SUSE Image SLES-SAP-BYOS-EC2, SUSE Image SLES-SAP-BYOS-GCE, SUSE Image SLES-SAP-GCE, SUSE Image SLES-SAP-GCE-3P, SUSE Image SLES-SAPCAL-GCE, SUSE Image SLES12-SP5-Azure-SAP-BYOS, SUSE Image SLES12-SP5-Azure-SAP-On-Demand, SUSE Image SLES12-SP5-EC2-SAP-BYOS, SUSE Image SLES12-SP5-EC2-SAP-On-Demand, SUSE Image SLES12-SP5-GCE-SAP-BYOS, SUSE Image SLES12-SP5-GCE-SAP-On-Demand, SUSE Liberty Linux 10, SUSE Liberty Linux 8, SUSE Liberty Linux 9, SUSE Linux Enterprise Desktop 15 SP7, SUSE Linux Enterprise Module for Basesystem 15 SP7, SUSE Linux Enterprise Server 15 SP7, SUSE Linux Enterprise Server for SAP Applications 15 SP7, SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS, SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, SUSE Linux Enterprise Server 12 SP5-LTSS, SUSE Linux Enterprise Server 15 SP4-LTSS, SUSE Linux Enterprise Server 15 SP5-LTSS, SUSE Linux Enterprise Server 15 SP6-LTSS, SUSE Linux Enterprise Server 16.0, SUSE Linux Enterprise Server for SAP applications 16.0, SUSE Linux Enterprise Server LTSS Extended Security 12 SP5, SUSE Linux Enterprise Server for SAP Applications 15 SP4, SUSE Linux Enterprise Server for SAP Applications 15 SP5, SUSE Linux Enterprise Server for SAP Applications 15 SP6, SUSE Manager Proxy LTS 4.3, SUSE Manager Retail Branch Server LTS 4.3, SUSE Manager Server LTS 4.3, openSUSE Leap 16.0, openSUSE Tumbleweed, libXfont2
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | libXfont2 | 2.0.6-5.el10_2.3 |
| AlmaLinux 10 | libXfont2-devel | 2.0.6-5.el10_2.3 |
| AlmaLinux 8 | libXfont2 | 2.0.3-2.el8_10.3 |
| AlmaLinux 8 | libXfont2-devel | 2.0.3-2.el8_10.3 |
| AlmaLinux 9 | libXfont2 | 2.0.3-12.el9_8.3 |
| AlmaLinux 9 | libXfont2-devel | 2.0.3-12.el9_8.3 |
| Amazon Linux 2 | libXfont | 1.5.4-1.amzn2.0.2 |
| Amazon Linux 2 | libXfont-devel | 1.5.4-1.amzn2.0.2 |
| Amazon Linux 2 | libXfont2 | 2.0.3-1.amzn2.0.2 |
| Amazon Linux 2 | libXfont2-devel | 2.0.3-1.amzn2.0.2 |
| Amazon Linux 2023 | libXfont2 | 2.0.7-1.amzn2023.0.3 |
| Amazon Linux 2023 | libXfont2-devel | 2.0.7-1.amzn2023.0.3 |
| Debian 12 | libxfont | no fix |
| Debian 13 | libxfont | no fix |
| Debian 14 | libxfont | 1:2.0.9-1 |
| Red Hat Enterprise Linux 10.2 | libXfont2 | 0:2.0.6-5.el10_2.3 |
| Red Hat Enterprise Linux 10.2 | libXfont2-debuginfo | 0:2.0.6-5.el10_2.3 |
| Red Hat Enterprise Linux 10.2 | libXfont2-debugsource | 0:2.0.6-5.el10_2.3 |
| Red Hat Enterprise Linux 10.2 | libXfont2-devel | 0:2.0.6-5.el10_2.3 |
| Red Hat Enterprise Linux 8 | libXfont2 | 0:2.0.3-2.el8_10.3 |
| Red Hat Enterprise Linux 8 | libXfont2-debuginfo | 0:2.0.3-2.el8_10.3 |
| Red Hat Enterprise Linux 8 | libXfont2-debugsource | 0:2.0.3-2.el8_10.3 |
| Red Hat Enterprise Linux 8 | libXfont2-devel | 0:2.0.3-2.el8_10.3 |
| Red Hat Enterprise Linux 9 | libXfont2 | 0:2.0.3-12.el9_8.3 |
| Red Hat Enterprise Linux 9 | libXfont2-debuginfo | 0:2.0.3-12.el9_8.3 |
| Red Hat Enterprise Linux 9 | libXfont2-debugsource | 0:2.0.3-12.el9_8.3 |
| Red Hat Enterprise Linux 9 | libXfont2-devel | 0:2.0.3-12.el9_8.3 |
| Red Hat Enterprise Linux eus 10.0 | libXfont2 | 0:2.0.6-5.el10_0.2 |
| Red Hat Enterprise Linux eus 10.0 | libXfont2-debuginfo | 0:2.0.6-5.el10_0.2 |
| Red Hat Enterprise Linux eus 10.0 | libXfont2-debugsource | 0:2.0.6-5.el10_0.2 |
| Red Hat Enterprise Linux eus 10.0 | libXfont2-devel | 0:2.0.6-5.el10_0.2 |
| Red Hat rhel aus 8.4 | libXfont2 | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel aus 8.4 | libXfont2-debuginfo | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel aus 8.4 | libXfont2-debugsource | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel aus 8.6 | libXfont2 | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel aus 8.6 | libXfont2-debuginfo | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel aus 8.6 | libXfont2-debugsource | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel e4s 8.8 | libXfont2 | 0:2.0.3-2.el8_8.2 |
| Red Hat rhel e4s 8.8 | libXfont2-debuginfo | 0:2.0.3-2.el8_8.2 |
| Red Hat rhel e4s 8.8 | libXfont2-debugsource | 0:2.0.3-2.el8_8.2 |
| Red Hat rhel e4s 9.2 | libXfont2 | 0:2.0.3-12.el9_2.3 |
| Red Hat rhel e4s 9.2 | libXfont2-debuginfo | 0:2.0.3-12.el9_2.3 |
| Red Hat rhel e4s 9.2 | libXfont2-debugsource | 0:2.0.3-12.el9_2.3 |
| Red Hat rhel e4s 9.4 | libXfont2 | 0:2.0.3-12.el9_4.3 |
| Red Hat rhel e4s 9.4 | libXfont2-debuginfo | 0:2.0.3-12.el9_4.3 |
| Red Hat rhel e4s 9.4 | libXfont2-debugsource | 0:2.0.3-12.el9_4.3 |
| Red Hat rhel els 7 | libXfont2 | 0:2.0.3-3.el7_9 |
| Red Hat rhel els 7 | libXfont2-debuginfo | 0:2.0.3-3.el7_9 |
| Red Hat rhel els 7 | libXfont2-devel | 0:2.0.3-3.el7_9 |
| Red Hat rhel eus 9.6 | libXfont2 | 0:2.0.3-12.el9_6.3 |
| Red Hat rhel eus 9.6 | libXfont2-debuginfo | 0:2.0.3-12.el9_6.3 |
| Red Hat rhel eus 9.6 | libXfont2-debugsource | 0:2.0.3-12.el9_6.3 |
| Red Hat rhel eus 9.6 | libXfont2-devel | 0:2.0.3-12.el9_6.3 |
| Red Hat rhel eus long life 8.4 | libXfont2 | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel eus long life 8.4 | libXfont2-debuginfo | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel eus long life 8.4 | libXfont2-debugsource | 0:2.0.3-2.el8_4.2 |
| Red Hat rhel eus long life 8.6 | libXfont2 | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libXfont2-debuginfo | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libXfont2-debugsource | 0:2.0.3-2.el8_6.2 |
| Red Hat rhel tus 8.8 | libXfont2 | 0:2.0.3-2.el8_8.2 |
| Red Hat rhel tus 8.8 | libXfont2-debuginfo | 0:2.0.3-2.el8_8.2 |
| Red Hat rhel tus 8.8 | libXfont2-debugsource | 0:2.0.3-2.el8_8.2 |
| Rocky Linux 10 | libXfont2 | 0:2.0.6-5.el10_2.3 |
| Rocky Linux 8 | libXfont2 | 0:2.0.3-2.el8_10.3 |
| Rocky Linux 9 | libXfont2 | 0:2.0.3-12.el9_8.3 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | libXfont2 | 2.0.3-3.6.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server 16.0 | libXfont2 | 2.0.7-160000.5.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | libXfont2 | 2.0.3-3.6.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | libXfont2 | 2.0.3-150000.3.6.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | libXfont2 | 2.0.7-160000.5.1 |
| Ubuntu 16.04 LTS | libxfont2 | no fix |
| openSUSE Leap 16.0 | libXfont2 | 2.0.7-160000.5.1 |
| openSUSE Tumbleweed | libXfont2 | 2.0.7-3.1 |