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CVE-2026-59679— fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2

Quick assessment

Affected
SUSE Container suse/kiosk/tigervnc-x11vnc:1.14-63.8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SUSE libXfont2是德国SUSE公司的一款图形窗口系统字体处理库。 SUSE libXfont2 2.0.3-150000.3.6.1之前版本存在缓冲区错误漏洞，该漏洞源于libXfont2字体服务器客户端中的fs_read_glyphs()函数未交叉检查FS_QueryXBitmaps16回复中的num_chars与FS_QueryXExtents16回复中的num_extents，导致恶意字体服务器可触发攻击者控制的堆越界读取和写入。

CVSS 9.0 · Critical EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 106

VendorProduct Version RangeStatus
libXfont2 libXfont2 ?≤ 2.0.8 affected
SUSE Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 ?< 2.0.3-150000.3.6.1 affected
SUSE Container suse/kiosk/xorg:21.1-83.7 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES-SAP-Azure ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-Azure-3P ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-BYOS-Azure ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-BYOS-EC2 ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-BYOS-GCE ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-GCE ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAP-GCE-3P ?< 2.0.7-160000.5.1 affected
SUSE Image SLES-SAPCAL-GCE ?< 2.0.7-160000.5.1 affected
SUSE Image SLES12-SP5-Azure-SAP-BYOS ?< 2.0.3-3.6.1 affected
SUSE Image SLES12-SP5-Azure-SAP-On-Demand ?< 2.0.3-3.6.1 affected
SUSE Image SLES12-SP5-EC2-SAP-BYOS ?< 2.0.3-3.6.1 affected
SUSE Image SLES12-SP5-EC2-SAP-On-Demand ?< 2.0.3-3.6.1 affected
SUSE Image SLES12-SP5-GCE-SAP-BYOS ?< 2.0.3-3.6.1 affected
SUSE Image SLES12-SP5-GCE-SAP-On-Demand ?< 2.0.3-3.6.1 affected
SUSE Image SLES15-SP6-SAP ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Azure-3P ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-BYOS ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-BYOS-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-BYOS-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-BYOS-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-BYOS ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-BYOS-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-BYOS-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-BYOS-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAP-Hardened-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAPCAL ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAPCAL-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAPCAL-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP6-SAPCAL-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Azure-3P ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-BYOS-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-BYOS-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-BYOS-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-GCE-3P ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Hardened-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Hardened-BYOS-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Hardened-BYOS-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Hardened-BYOS-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAP-Hardened-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAPCAL-Azure ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAPCAL-EC2 ?< 2.0.3-150000.3.6.1 affected
SUSE Image SLES15-SP7-SAPCAL-GCE ?< 2.0.3-150000.3.6.1 affected
SUSE openSUSE Leap 16.0 ?< 2.0.7-160000.5.1 affected
?< 2.0.7-160000.5.1 affected
SUSE openSUSE Tumbleweed ?< 2.0.7-3.1 affected
?< 2.0.7-3.1 affected
?< 2.0.7-3.1 affected
?< 2.0.7-3.1 affected
SUSE SUSE Liberty Linux 10 ?< 2.0.6-5.el10_2.3 affected
?< 2.0.6-5.el10_2.3 affected
SUSE SUSE Liberty Linux 8 ?< 2.0.3-2.el8_10.3 affected
?< 2.0.3-2.el8_10.3 affected
SUSE SUSE Liberty Linux 9 ?< 2.0.3-12.el9_8.3 affected
?< 2.0.3-12.el9_8.3 affected
SUSE SUSE Linux Enterprise Desktop 15 SP7 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Module for Basesystem 15 SP7 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server 12 SP5-LTSS ?< 2.0.3-3.6.1 affected
SUSE SUSE Linux Enterprise Server 15 SP4-LTSS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server 15 SP5-LTSS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server 15 SP6-LTSS ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server 15 SP7 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server 16.0 ?< 2.0.7-160000.5.1 affected
?< 2.0.7-160000.5.1 affected
SUSE SUSE Linux Enterprise Server for SAP Applications 15 SP4 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server for SAP Applications 15 SP5 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server for SAP Applications 15 SP6 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server for SAP Applications 15 SP7 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Linux Enterprise Server for SAP applications 16.0 ?< 2.0.7-160000.5.1 affected
?< 2.0.7-160000.5.1 affected
SUSE SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 ?< 2.0.3-3.6.1 affected
SUSE SUSE Manager Proxy LTS 4.3 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Manager Retail Branch Server LTS 4.3 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
SUSE SUSE Manager Server LTS 4.3 ?< 2.0.3-150000.3.6.1 affected
?< 2.0.3-150000.3.6.1 affected
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I. Basic Information for CVE-2026-59679

Vulnerability Information
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Vulnerability Title
fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
SUSE libXfont2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SUSE libXfont2是德国SUSE公司的一款图形窗口系统字体处理库。 SUSE libXfont2 2.0.3-150000.3.6.1之前版本存在缓冲区错误漏洞，该漏洞源于libXfont2字体服务器客户端中的fs_read_glyphs()函数未交叉检查FS_QueryXBitmaps16回复中的num_chars与FS_QueryXExtents16回复中的num_extents，导致恶意字体服务器可触发攻击者控制的堆越界读取和写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 -

II. Public POCs for CVE-2026-59679

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III. Intelligence Information for CVE-2026-59679

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Vendor Advisories for CVE-2026-59679 (1)

IV. Related Vulnerabilities

Same product: Container suse/kiosk/tigervnc-x11vnc:1.14-63.8
Same vendor: SUSE