CVE-2026-44950

fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's 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. A 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.

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-2026-44950

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-10 09:17

Updated : 2026-09-10 19:17

NVD link : CVE-2026-44950

Mitre link : CVE-2026-44950

CVE.ORG link : CVE-2026-44950

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

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"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": "libXfont", "product": "libXfont", "versions": [{"status": "affected", "version": "?", "versionType": "custom", "lessThanOrEqual": "2.0.8"}], "packageName": "libXfont", "defaultStatus": "unaffected"}]}], "published": "2026-09-10T09:17:02.490", "references": [{"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950", "source": "meissner@suse.de"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's 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."}], "lastModified": "2026-09-10T19:17:27.730", "sourceIdentifier": "meissner@suse.de"}