CVE-2026-44950 (GCVE-0-2026-44950)
Vulnerability from cvelistv5
Published
2026-09-10 08:19
Modified
2026-09-10 18:26
Severity ?
9.0 (Critical) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.5 (Critical) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
9.5 (Critical) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
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\"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\"}], \"datePublic\": \"2026-08-05T08:17:00.000Z\", \"references\": [{\"url\": \"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003efs_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.\u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"shortName\": \"suse\", \"dateUpdated\": \"2026-09-10T08:19:55.462Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-44950\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T18:26:50.408Z\", \"dateReserved\": \"2026-05-08T12:29:48.969Z\", \"assignerOrgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"datePublished\": \"2026-09-10T08:19:55.462Z\", \"assignerShortName\": \"suse\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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