CVE-2026-59679 (GCVE-0-2026-59679)
Vulnerability from cvelistv5 – Published: 2026-09-10 08:15 – Updated: 2026-09-10 12:45
VLAI
EPSS
VEX
Title
fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2
Summary
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.
Severity
9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 12:44 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
1 reference
Impacted products
80 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SUSE | Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Container suse/kiosk/xorg:21.1-83.7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-EC2 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAPCAL-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 10 |
Affected:
? , < 2.0.6-5.el10_2.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 8 |
Affected:
? , < 2.0.3-2.el8_10.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 9 |
Affected:
? , < 2.0.3-12.el9_8.3
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Desktop 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Module for Basesystem 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 12 SP5-LTSS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP6-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP applications 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP4 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP5 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP6 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Proxy LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Retail Branch Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | openSUSE Leap 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | openSUSE Tumbleweed |
Affected:
? , < 2.0.7-3.1
(custom)
|
guessed | |
| libXfont2 | libXfont2 |
Affected:
? , ≤ 2.0.8
(custom)
|
guessed |
Date Public
2026-08-05 08:10
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-59679",
"options": [
{
"Exploitation": "none"
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{
"Automatable": "no"
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"Technical Impact": "total"
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"timestamp": "2026-09-10T12:44:48.987855Z",
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{
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{
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{
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{
"defaultStatus": "unaffected",
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{
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-BYOS-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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"version": "?",
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]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-GCE",
"vendor": "SUSE",
"versions": [
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{
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{
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{
"defaultStatus": "unaffected",
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{
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},
{
"defaultStatus": "unaffected",
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"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-BYOS-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
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"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-Azure",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
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"source": "meissner@suse.de"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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.\nA 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."
}
],
"id": "CVE-2026-59679",
"lastModified": "2026-09-10T15:43:03.760",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.