fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2
Summary
| CVE | CVE-2026-59679 |
|---|---|
| State | PUBLISHED |
| Assigner | suse |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-10 09:17:02 UTC |
| Updated | 2026-09-10 15:43:03 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.2 CRITICAL from [email protected]
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.004110000 probability, percentile 0.346330000 (date 2026-09-13)
Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 9.2 | CRITICAL | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 9.2 | CRITICAL | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Secondary | 9 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
HighAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | SUSE | Container Suse/kiosk/tigervnc-x11vnc1.14-63.8 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Container Suse/kiosk/xorg21.1-83.7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Azure-3P | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-BYOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-BYOS-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-BYOS-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-BYOS-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-BYOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAP-Hardened-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAPCAL | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAPCAL-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAPCAL-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP6-SAPCAL-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Azure-3P | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-BYOS-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-BYOS-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-BYOS-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-GCE-3P | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Hardened-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAP-Hardened-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAPCAL-Azure | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAPCAL-EC2 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES15-SP7-SAPCAL-GCE | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-Azure | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-Azure-3P | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-BYOS-Azure | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-BYOS-EC2 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-BYOS-GCE | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-GCE | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAP-GCE-3P | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES-SAPCAL-GCE | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-Azure-SAP-BYOS | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-Azure-SAP-On-Demand | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-EC2-SAP-BYOS | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-EC2-SAP-On-Demand | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-GCE-SAP-BYOS | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | Image SLES12-SP5-GCE-SAP-On-Demand | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 10 | affected ? 2.0.6-5.el10_2.3 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 10 | affected ? 2.0.6-5.el10_2.3 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 8 | affected ? 2.0.3-2.el8_10.3 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 8 | affected ? 2.0.3-2.el8_10.3 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 9 | affected ? 2.0.3-12.el9_8.3 custom | Not specified |
| CNA | SUSE | SUSE Liberty Linux 9 | affected ? 2.0.3-12.el9_8.3 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Desktop 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Desktop 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Module For Basesystem 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Module For Basesystem 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP7 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 12 SP5-LTSS | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP4-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP4-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP5-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP5-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP6-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 15 SP6-LTSS | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | affected ? 2.0.3-3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP4 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP4 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP5 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP5 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP6 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Linux Enterprise Server For SAP Applications 15 SP6 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Proxy LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Proxy LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Retail Branch Server LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Retail Branch Server LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Server LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | SUSE Manager Server LTS 4.3 | affected ? 2.0.3-150000.3.6.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Leap 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Leap 16.0 | affected ? 2.0.7-160000.5.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Tumbleweed | affected ? 2.0.7-3.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Tumbleweed | affected ? 2.0.7-3.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Tumbleweed | affected ? 2.0.7-3.1 custom | Not specified |
| CNA | SUSE | OpenSUSE Tumbleweed | affected ? 2.0.7-3.1 custom | Not specified |
| CNA | LibXfont2 | LibXfont2 | affected ? 2.0.8 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.suse.com/show_bug.cgi | [email protected] | bugzilla.suse.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: zx (Jace) (en)
There are currently no legacy QID mappings associated with this CVE.