{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-59679", "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "state": "PUBLISHED", "assignerShortName": "suse", "dateReserved": "2026-07-06T11:59:28.119Z", "datePublished": "2026-09-10T08:15:24.892Z", "dateUpdated": "2026-09-10T12:45:33.969Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "shortName": "suse", "dateUpdated": "2026-09-10T08:15:24.892Z" }, "title": "fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2", "datePublic": "2026-08-05T08:10:00.000Z", "affected": [ { "vendor": "SUSE", "product": "Container suse/kiosk/tigervnc-x11vnc:1.14-63.8", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "Container suse/kiosk/xorg:21.1-83.7", "packageName": 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applications 16.0", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP4", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP4", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP5", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP5", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP6", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Linux Enterprise Server for SAP Applications 15 SP6", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Proxy LTS 4.3", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Proxy LTS 4.3", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Retail Branch Server LTS 4.3", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Retail Branch Server LTS 4.3", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Server LTS 4.3", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "SUSE Manager Server LTS 4.3", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.3-150000.3.6.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Leap 16.0", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Leap 16.0", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-160000.5.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Tumbleweed", "packageName": "libXfont2-2", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Tumbleweed", "packageName": "libXfont2-2-32bit", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Tumbleweed", "packageName": "libXfont2-devel", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "SUSE", "product": "openSUSE Tumbleweed", "packageName": "libXfont2-devel-32bit", "versions": [ { "status": "affected", "version": "?", "lessThan": "2.0.7-3.1", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "libXfont2", "product": "libXfont2", "packageName": "libXfont2", "versions": [ { "status": "affected", "version": "?", "lessThanOrEqual": "2.0.8", "versionType": "custom" } ], "defaultStatus": "unaffected" } ], "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.", "supportingMedia": [ { "type": "text/html", "base64": false, "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.
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.
" } ] } ], "references": [ { "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679" } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.2, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N" } } ], "credits": [ { "lang": "en", "value": "zx (Jace)", "type": "finder" } ], "source": { "discovery": "UNKNOWN" }, "x_generator": { "engine": "Vulnogram 0.1.0-dev" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-787", "lang": "en", "description": "CWE-787 Out-of-bounds Write" } ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-10T12:44:48.987855Z", "id": "CVE-2026-59679", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-10T12:45:33.969Z" } } ] } }