CVE-2026-59679 (GCVE-0-2026-59679)
Vulnerability from cvelistv5
Published
2026-09-10 08:15
Modified
2026-09-10 12:45
Severity ?
9.0 (Critical) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.2 (Critical) - 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
9.2 (Critical) - 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
VLAI Severity ?
EPSS score ?
Summary
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
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\": \"libXfont2\", \"product\": \"libXfont2\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"2.0.8\"}], \"packageName\": \"libXfont2\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-08-05T08:10:00.000Z\", \"references\": [{\"url\": \"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59679\"}], \"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) 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\", \"value\": \"\u003cpre\u003efs_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.\u003cbr\u003eA 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. \u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"shortName\": \"suse\", \"dateUpdated\": \"2026-09-10T08:15:24.892Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-59679\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T12:45:33.969Z\", \"dateReserved\": \"2026-07-06T11:59:28.119Z\", \"assignerOrgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"datePublished\": \"2026-09-10T08:15:24.892Z\", \"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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