Critical
Security advisory
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-14599
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:42 UTC · Revision 1
Source evidence
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.
osv:CVE-2018-14599
Complete source record
{
"id": "427a96f65ea2981f45297fcbebcad86767596c0ef55c50265c6979ffbba0f43a",
"url": "https://osv.dev/vulnerability/CVE-2018-14599",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-14599",
"summary": "An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.",
"evidence": "osv:CVE-2018-14599",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2018-14599",
"aliases": [
"CVE-2018-14599"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mirror/libx11",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "42f4d7af9cf6d1dbfa575552e057328b054a20c9"
}
],
"database_specific": {
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{
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"range": [
{
"introduced": "0"
},
{
"last_affected": "1.6.5"
}
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"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"libX11-1.6.4",
"libX11-1.6.3",
"libX11-1.6.2",
"libX11-1.6.1",
"libX11-1.6.0",
"libX11-1.5.99.902",
"libX11-1.5.99.901",
"libX11-1.5.0",
"libX11-1.4.99.902",
"libX11-1.4.99.901",
"libX11-1.4.99.1",
"libX11-1.4.4",
"libX11-1.4.3",
"libX11-1.4.2",
"libX11-1.4.1",
"libX11-1.4.0",
"libX11-1.3.99.903",
"libX11-1.3.99.902",
"libX11-1.3.99.901",
"libX11-1.3.4",
"libX11-1.3.3",
"libX11-1.3.2",
"libX11-1.3.1",
"libX11-1.3",
"libX11-1.2.99.901",
"libX11-1.2.2",
"libX11-1.2.1",
"libX11-1.2",
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"libX11-1.1.4",
"libX11-1.1.3",
"libX11-1.1.2",
"XORG-6_99_99_904",
"MODULAR_COPY",
"XORG-6_99_99_903",
"XORG-6_8_99_903",
"XORG-6_99_99_902",
"XORG-6_8_99_902",
"XORG-6_99_99_901",
"XORG-6_8_99_901",
"XORG-6_99_99_900",
"XORG-6_8_99_900",
"XORG-6_8_99_15",
"XORG-6_8_99_14",
"XORG-6_8_99_13",
"XORG-6_8_99_10",
"XORG-6_8_99_9",
"XORG-6_8_99_7",
"XORG-6_8_99_6",
"XORG-6_8_1",
"XORG-6_7_99_903",
"XORG-6_7_99_902",
"XORG-6_7_99_2",
"XORG-6_7_99_1",
"XACE-SELINUX-MERGE",
"XORG-MAIN"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-14599.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.freedesktop.org/xorg/lib/libx11",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "42f4d7af9cf6d1dbfa575552e057328b054a20c9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "1.6.5"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"libX11-1.6.5",
"libX11-1.6.4",
"libX11-1.6.3",
"libX11-1.6.2",
"libX11-1.6.1",
"libX11-1.6.0",
"libX11-1.5.99.902",
"libX11-1.5.99.901",
"libX11-1.5.0",
"libX11-1.4.99.902",
"libX11-1.4.99.901",
"libX11-1.4.99.1",
"libX11-1.4.4",
"libX11-1.4.3",
"libX11-1.4.2",
"libX11-1.4.1",
"libX11-1.4.0",
"libX11-1.3.99.903",
"libX11-1.3.99.902",
"libX11-1.3.99.901",
"libX11-1.3.4",
"libX11-1.3.3",
"libX11-1.3.2",
"libX11-1.3.1",
"libX11-1.3",
"libX11-1.2.99.901",
"libX11-1.2.2",
"libX11-1.2.1",
"libX11-1.2",
"libX11-1.1.99.2",
"libX11-1.1.4",
"libX11-1.1.3",
"libX11-1.1.2",
"XORG-6_99_99_904",
"MODULAR_COPY",
"XORG-6_99_99_903",
"XORG-6_8_99_903",
"XORG-6_99_99_902",
"XORG-6_8_99_902",
"XORG-6_99_99_901",
"XORG-6_8_99_901",
"XORG-6_99_99_900",
"XORG-6_8_99_900",
"XORG-6_8_99_15",
"XORG-6_8_99_14",
"XORG-6_8_99_13",
"XORG-6_8_99_10",
"XORG-6_8_99_9",
"XORG-6_8_99_7",
"XORG-6_8_99_6",
"XORG-6_8_1",
"XORG-6_7_99_903",
"XORG-6_7_99_902",
"XORG-6_7_99_2",
"XORG-6_7_99_1",
"XACE-SELINUX-MERGE",
"XORG-MAIN"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-14599.json"
}
}
],
"modified": "2026-10-24T10:49:37.735661616Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F/",
"https://access.redhat.com/errata/RHSA-2019:2079",
"https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html",
"https://lists.x.org/archives/xorg-announce/2018-August/002916.html",
"https://security.gentoo.org/glsa/201811-01",
"https://usn.ubuntu.com/3758-1/",
"https://usn.ubuntu.com/3758-2/",
"https://bugzilla.suse.com/show_bug.cgi?id=1102062",
"https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=b469da1430cdcee06e31c6251b83aede072a1ff0"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
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"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
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},
{
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},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
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}
],
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]
},
{
"cpes": [
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],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
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{
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}
],
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}
]
},
{
"cpes": [
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],
"vendor_product": "redhat:enterprise_linux_desktop",
"extracted_events": [
{
"range": [
{
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{
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}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server",
"extracted_events": [
{
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],
"source": "CPE_STRING"
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},
{
"cpes": [
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],
"vendor_product": "redhat:enterprise_linux_workstation",
"extracted_events": [
{
"range": [
{
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},
{
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],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-14599",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 441778,
"published_at": "2018-08-24T19:29:01.457+00:00"
}