CVE-2026-59679Network attack vector

Privilege escalation or crash via mismatched reply counts

Published Sep 10, 2026 · Updated Sep 10, 2026

Out-of-bounds access in libXfont2 2.0.8 and earlier allows remote attackers controlling a font server to read and write heap memory. fs_read_glyphs() sizes encoding[] from num_extents but indexes it with unchecked num_chars from a separate reply. A client must connect to that server; exploitation can crash an unprivileged X server or elevate privileges when it runs as root.

CVSS severity9.2
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds access in libXfont2 2.0.8 and earlier allows remote attackers controlling a font server to read and write heap memory. fs_read_glyphs() sizes encoding[] from num_extents but indexes it with unchecked num_chars from a separate reply. A client must connect to that server; exploitation can crash an unprivileged X server or elevate privileges when it runs as root.

The record

CVE
CVE-2026-59679
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
NeuVector
Product
SLES 12 SP5 EC2 SAP BYOS Image
Classifications
CWE-125, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=? <2.0.3-3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NeuVector · SLES 12 SP5 EC2 SAP BYOS Imageversion=? <2.0.3-3.6.1
NeuVector · SLES SAP GCE 3P Imageversion=? <2.0.7-160000.5.1
NeuVector · SUSE Kiosk TigerVNC X11VNC Container Imageversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Linux Enterprise High Performance Computingversion=? <2.0.3-150000.3.6.1
NeuVector · Image SLES15-SP7-SAP-BYOS-GCEversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Liberty Linux 8version=? <2.0.3-2.el8_10.3
NeuVector · SUSE Linux Enterprise Server LTSS Extended Securityversion=? <2.0.3-3.6.1
NeuVector · Image SLES15-SP7-SAP-EC2version=? <2.0.3-150000.3.6.1
NeuVector · SLES SAP BYOS EC2 Imageversion=? <2.0.7-160000.5.1
NeuVector · SLES SAP BYOS GCE Imageversion=? <2.0.7-160000.5.1
NeuVector · SLES SAP Azure Imageversion=? <2.0.7-160000.5.1
NeuVector · Image SLES15-SP7-SAP-Hardened-BYOS-EC2version=? <2.0.3-150000.3.6.1
NeuVector · SLES SAP Azure 3P Imageversion=? <2.0.7-160000.5.1
NeuVector · SLES 15 SP6 SAP Imageversion=? <2.0.3-150000.3.6.1
NeuVector · SLES SAP GCE Imageversion=? <2.0.7-160000.5.1
NeuVector · SUSE Linux Enterprise Module for Basesystemversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Liberty Linux 10version=? <2.0.6-5.el10_2.3
NeuVector · Image SLES15-SP7-SAPCAL-EC2version=? <2.0.3-150000.3.6.1
NeuVector · openSUSE Leap 16.0version=? <2.0.7-160000.5.1
NeuVector · SLES 12 SP5 Azure SAP BYOS Imageversion=? <2.0.3-3.6.1
NeuVector · Image SLES15-SP7-SAP-GCE-3Pversion=? <2.0.3-150000.3.6.1
NeuVector · SLES SAP BYOS Azure Imageversion=? <2.0.7-160000.5.1
NeuVector · SLES 15 SP6 SAP BYOS Imageversion=? <2.0.3-150000.3.6.1
NeuVector · Image SLES15-SP7-SAP-Hardened-Azureversion=? <2.0.3-150000.3.6.1
NeuVector · SLES 12 SP5 GCE SAP BYOS Imageversion=? <2.0.3-3.6.1
NeuVector · SUSE Kiosk Xorg Container Imageversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Liberty Linux 9version=? <2.0.3-12.el9_8.3
NeuVector · Image SLES15-SP7-SAPCAL-Azureversion=? <2.0.3-150000.3.6.1
NeuVector · SLES 12 SP5 Azure SAP On-Demand Imageversion=? <2.0.3-3.6.1
NeuVector · SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOSversion=? <2.0.3-150000.3.6.1
NeuVector · Image SLES15-SP7-SAP-GCEversion=? <2.0.3-150000.3.6.1
NeuVector · SLES 12 SP5 GCE SAP On-Demand Imageversion=? <2.0.3-3.6.1
NeuVector · SUSE Linux Enterprise Server for SAP Applicationsversion=? <2.0.3-150000.3.6.1; version=? <2.0.7-160000.5.1
NeuVector · Image SLES15-SP7-SAP-Hardened-BYOS-GCEversion=? <2.0.3-150000.3.6.1
X.Org · libXfont2version=? <=2.0.8
NeuVector · Image SLES15-SP7-SAPCAL-GCEversion=? <2.0.3-150000.3.6.1
NeuVector · Image SLES15-SP7-SAP-BYOS-EC2version=? <2.0.3-150000.3.6.1
NeuVector · SUSE Manager Proxyversion=? <2.0.3-150000.3.6.1
NeuVector · SLES SAPCAL GCE Imageversion=? <2.0.7-160000.5.1
NeuVector · SLES 12 SP5 EC2 SAP On-Demand Imageversion=? <2.0.3-3.6.1
NeuVector · Image SLES15-SP7-SAP-Hardened-GCEversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Manager Serverversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Manager Retail Branch Serverversion=? <2.0.3-150000.3.6.1
NeuVector · openSUSE Tumbleweedversion=? <2.0.7-3.1
NeuVector · SUSE Linux Enterprise Desktop 15 SP7version=? <2.0.3-150000.3.6.1
NeuVector · Image SLES15-SP7-SAP-Hardened-BYOS-Azureversion=? <2.0.3-150000.3.6.1
NeuVector · SUSE Linux Enterprise Serverversion=? <2.0.3-150000.3.6.1; version=? <2.0.3-3.6.1; version=? <2.0.7-160000.5.1
NeuVector · SLES 15 SP6 SAP Azure 3P Imageversion=? <2.0.3-150000.3.6.1
NeuVector · SLES 15 SP6 SAP Azure Imageversion=? <2.0.3-150000.3.6.1

Published CVSS scores

9.2SUSECVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.0SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo