SUSE-SU-2026:23151-1
Vulnerability from csaf_suse - Published: 2026-08-06 09:11 - Updated: 2026-09-16 20:12Summary
Security update for libXfont2
Severity
Critical
Notes
Title of the patch: Security update for libXfont2
Description of the patch: This update for libXfont2 fixes the following issues:
- CVE-2026-44950: fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow (bsc#1272661).
- CVE-2026-59679: fs_read_glyphs() heap OOB read/write via encoding array index mismatch (bsc#1272660).
Patchnames: SUSE-SLES-16.0-1438
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
9 (Critical)
Affected products
Recommended
16 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-2-2.0.7-160000.5.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-2-2.0.7-160000.5.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-2-2.0.7-160000.5.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-2-2.0.7-160000.5.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-devel-2.0.7-160000.5.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-devel-2.0.7-160000.5.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-devel-2.0.7-160000.5.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libXfont2-devel-2.0.7-160000.5.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-2-2.0.7-160000.5.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-2-2.0.7-160000.5.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-2-2.0.7-160000.5.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-2-2.0.7-160000.5.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-devel-2.0.7-160000.5.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-devel-2.0.7-160000.5.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-devel-2.0.7-160000.5.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libXfont2-devel-2.0.7-160000.5.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
critical
9 (Critical)
Affected products
Recommended
16 products, the same list as for
CVE-2026-44950
Threats
Impact
critical
References
13 references
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"vulnerabilities": [
{
"cve": "CVE-2026-44950",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-44950"
}
],
"notes": [
{
"category": "general",
"text": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph\u0027s 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.\n\nA 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.",
"title": "CVE description"
}
],
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]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-44950",
"url": "https://www.suse.com/security/cve/CVE-2026-44950"
},
{
"category": "external",
"summary": "SUSE Bug 1268514 for CVE-2026-44950",
"url": "https://bugzilla.suse.com/1268514"
},
{
"category": "external",
"summary": "SUSE Bug 1272661 for CVE-2026-44950",
"url": "https://bugzilla.suse.com/1272661"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
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}
],
"scores": [
{
"cvss_v3": {
"baseScore": 9,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-06T09:11:09Z",
"details": "critical"
}
],
"title": "CVE-2026-44950"
},
{
"cve": "CVE-2026-59679",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-59679"
}
],
"notes": [
{
"category": "general",
"text": "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.",
"title": "CVE description"
}
],
"product_status": {
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"summary": "CVE-2026-59679",
"url": "https://www.suse.com/security/cve/CVE-2026-59679"
},
{
"category": "external",
"summary": "SUSE Bug 1272660 for CVE-2026-59679",
"url": "https://bugzilla.suse.com/1272660"
}
],
"remediations": [
{
"category": "vendor_fix",
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"version": "3.1"
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],
"threats": [
{
"category": "impact",
"date": "2026-08-06T09:11:09Z",
"details": "critical"
}
],
"title": "CVE-2026-59679"
}
]
}
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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.
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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.
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