CVE-2026-59679

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.

CVSS v3 9.0 CRITICAL

9.0^/10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-10 09:17

Updated : 2026-09-10 15:43

NVD link : CVE-2026-59679

Mitre link : CVE-2026-59679

CVE.ORG link : CVE-2026-59679

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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"versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server 15 SP4-LTSS", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server 15 SP5-LTSS", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server 15 SP5-LTSS", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server 15 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applications 16.0", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP applications 16.0", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP4", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP4", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP5", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP5", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP6", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP6", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Proxy LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Proxy LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Retail Branch Server LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Retail Branch Server LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Server LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "SUSE Manager Server LTS 4.3", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Leap 16.0", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Leap 16.0", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Tumbleweed", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom"}], "packageName": "libXfont2-2", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Tumbleweed", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom"}], "packageName": "libXfont2-2-32bit", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Tumbleweed", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom"}], "packageName": "libXfont2-devel", "defaultStatus": "unaffected"}, {"vendor": "SUSE", "product": "openSUSE Tumbleweed", "versions": [{"status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom"}], "packageName": "libXfont2-devel-32bit", "defaultStatus": "unaffected"}, {"vendor": "libXfont2", "product": "libXfont2", "versions": [{"status": "affected", "version": "?", "versionType": "custom", "lessThanOrEqual": "2.0.8"}], "packageName": "libXfont2", "defaultStatus": "unaffected"}]}], "published": "2026-09-10T09:17:02.883", "references": [{"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679", "source": "meissner@suse.de"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-787"}]}], "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."}], "lastModified": "2026-09-10T15:43:03.760", "sourceIdentifier": "meissner@suse.de"}