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Back to active CVEs
Critical ยท CVSS 9.2CVE-2026-59679

fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2CVE-2026-59679

Answer in brief

CVE-2026-59679 records a Critical severity (CVSS 9.2) vulnerability in fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2. The current sources do not mark it as known exploited. The current feed maps SUSE/Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 (generic), SUSE/Container suse/kiosk/xorg:21.1-83.7 (generic), SUSE/Image SLES12-SP5-Azure-SAP-BYOS (generic), SUSE/Image SLES12-SP5-Azure-SAP-On-Demand (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 10, 2026Updated Sep 10, 2026Source checked Oct 25, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026
Upstream Advisory

Key facts

Risk
Critical ยท CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
81 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SUSE/Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 (generic), SUSE/Container suse/kiosk/xorg:21.1-83.7 (generic), SUSE/Image SLES12-SP5-Azure-SAP-BYOS (generic), SUSE/Image SLES12-SP5-Azure-SAP-On-Demand (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SUSE/Container suse/kiosk/tigervnc-x11vnc:1.14-63.8generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Container suse/kiosk/xorg:21.1-83.7generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES12-SP5-Azure-SAP-BYOSgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES12-SP5-Azure-SAP-On-Demandgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES12-SP5-EC2-SAP-BYOSgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES12-SP5-EC2-SAP-On-Demandgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES12-SP5-GCE-SAP-BYOSgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES12-SP5-GCE-SAP-On-Demandgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/Image SLES15-SP6-SAPgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Azure-3Pgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-BYOSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-BYOS-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-BYOS-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-BYOS-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAPCALgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAPCAL-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAPCAL-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAPCAL-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardenedgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-BYOSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP6-SAP-Hardened-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Azure-3Pgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-BYOS-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-BYOS-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-BYOS-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAPCAL-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAPCAL-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAPCAL-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-GCE-3Pgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Hardened-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-Azuregeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-EC2generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES15-SP7-SAP-Hardened-GCEgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/Image SLES-SAP-Azuregeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-Azure-3Pgeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-BYOS-Azuregeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-BYOS-EC2generic>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-BYOS-GCEgeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAPCAL-GCEgeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-GCEgeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/Image SLES-SAP-GCE-3Pgeneric>=? <2.0.7-160000.5.12.0.7-160000.5.1
libXfont2/libXfont2generic?Not reported
libXfont2/libXfont2generic>=? <=2.0.8Not reported
SUSE/openSUSE Leap 16.0generic>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/openSUSE Tumbleweedgeneric>=? <2.0.7-3.12.0.7-3.1
SUSE/SUSE Liberty Linux 10generic>=? <2.0.6-5.el10_2.32.0.6-5.el10_2.3
SUSE/SUSE Liberty Linux 8generic>=? <2.0.3-2.el8_10.32.0.3-2.el8_10.3
SUSE/SUSE Liberty Linux 9generic>=? <2.0.3-12.el9_8.32.0.3-12.el9_8.3
SUSE/SUSE Linux Enterprise Desktop 15 SP7generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise High Performance Computing 15 SP4-LTSSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise High Performance Computing 15 SP5-LTSSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Module for Basesystem 15 SP7generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server 12 SP5-LTSSgeneric>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/SUSE Linux Enterprise Server 15 SP4-LTSSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server 15 SP5-LTSSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server 15 SP6-LTSSgeneric>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server 15 SP7generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server 16.0generic>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP4generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP5generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP6generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP7generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Linux Enterprise Server for SAP applications 16.0generic>=? <2.0.7-160000.5.12.0.7-160000.5.1
SUSE/SUSE Linux Enterprise Server LTSS Extended Security 12 SP5generic>=? <2.0.3-3.6.12.0.3-3.6.1
SUSE/SUSE Manager Proxy LTS 4.3generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Manager Retail Branch Server LTS 4.3generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1
SUSE/SUSE Manager Server LTS 4.3generic>=? <2.0.3-150000.3.6.12.0.3-150000.3.6.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SUSE/Container suse/kiosk/tigervnc-x11vnc:1.14-63.8, SUSE/Container suse/kiosk/xorg:21.1-83.7, SUSE/Image SLES12-SP5-Azure-SAP-BYOS.
  2. 2Review the reported fix. Update SUSE/Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 to 2.0.3-150000.3.6.1; SUSE/Container suse/kiosk/xorg:21.1-83.7 to 2.0.3-150000.3.6.1; SUSE/Image SLES12-SP5-Azure-SAP-BYOS to 2.0.3-3.6.1; SUSE/Image SLES12-SP5-Azure-SAP-On-Demand to 2.0.3-3.6.1; SUSE/Image SLES12-SP5-EC2-SAP-BYOS to 2.0.3-3.6.1; SUSE/Image SLES12-SP5-EC2-SAP-On-Demand to 2.0.3-3.6.1; SUSE/Image SLES12-SP5-GCE-SAP-BYOS to 2.0.3-3.6.1; SUSE/Image SLES12-SP5-GCE-SAP-On-Demand to 2.0.3-3.6.1; SUSE/Image SLES15-SP6-SAP to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Azure-3P to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-BYOS to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-BYOS-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-BYOS-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-BYOS-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAPCAL to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAPCAL-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAPCAL-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAPCAL-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-BYOS to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-BYOS-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP6-SAP-Hardened-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Azure-3P to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-BYOS-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-BYOS-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-BYOS-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAPCAL-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAPCAL-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAPCAL-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-GCE-3P to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Hardened-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-Azure to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-EC2 to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Hardened-BYOS-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES15-SP7-SAP-Hardened-GCE to 2.0.3-150000.3.6.1; SUSE/Image SLES-SAP-Azure to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-Azure-3P to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-BYOS-Azure to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-BYOS-EC2 to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-BYOS-GCE to 2.0.7-160000.5.1; SUSE/Image SLES-SAPCAL-GCE to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-GCE to 2.0.7-160000.5.1; SUSE/Image SLES-SAP-GCE-3P to 2.0.7-160000.5.1; SUSE/openSUSE Leap 16.0 to 2.0.7-160000.5.1; SUSE/openSUSE Tumbleweed to 2.0.7-3.1; SUSE/SUSE Liberty Linux 10 to 2.0.6-5.el10_2.3; SUSE/SUSE Liberty Linux 8 to 2.0.3-2.el8_10.3; SUSE/SUSE Liberty Linux 9 to 2.0.3-12.el9_8.3; SUSE/SUSE Linux Enterprise Desktop 15 SP7 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Module for Basesystem 15 SP7 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server 12 SP5-LTSS to 2.0.3-3.6.1; SUSE/SUSE Linux Enterprise Server 15 SP4-LTSS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server 15 SP5-LTSS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server 15 SP6-LTSS to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server 15 SP7 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server 16.0 to 2.0.7-160000.5.1; SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP4 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP5 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP6 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server for SAP Applications 15 SP7 to 2.0.3-150000.3.6.1; SUSE/SUSE Linux Enterprise Server for SAP applications 16.0 to 2.0.7-160000.5.1; SUSE/SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 to 2.0.3-3.6.1; SUSE/SUSE Manager Proxy LTS 4.3 to 2.0.3-150000.3.6.1; SUSE/SUSE Manager Retail Branch Server LTS 4.3 to 2.0.3-150000.3.6.1; SUSE/SUSE Manager Server LTS 4.3 to 2.0.3-150000.3.6.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 10, 2026

Sources and claim methodology

  • Source referencebugzilla.suse.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 25, 2026
References
1 linked source
Open source record