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CVE-2026-44950— fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow 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存在缓冲区错误漏洞，该漏洞源于fs_read_glyphs()未检查目标游标是否超出分配，恶意字体服务器可发送重叠源偏移，导致累积写入超过目标缓冲区，造成堆缓冲区溢出，攻击者可控制内容。

CVSS 9.0 · Critical EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1029 · Scheduled Transfer

Affected Version Matrix 106

VendorProduct Version RangeStatus
libXfont libXfont ?≤ 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-2026-44950

Vulnerability Information
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Vulnerability Title
fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow in libXfont2
Source: CVE Program / CVE List V5
Vulnerability 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.
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存在缓冲区错误漏洞，该漏洞源于fs_read_glyphs()未检查目标游标是否超出分配，恶意字体服务器可发送重叠源偏移，导致累积写入超过目标缓冲区，造成堆缓冲区溢出，攻击者可控制内容。
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-2026-44950

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III. Intelligence Information for CVE-2026-44950

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Vendor Advisories for CVE-2026-44950 (1)

IV. Related Vulnerabilities

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