MediumFix available
libxkbcommon, x11-xkb-utils — security advisory
Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.
- Products
- libxkbcommon, x11-xkb-utils
- Affected versions
- 7.7+7, 7.7+8, 7.7+9
- Fixed versions
- 0.8.2-1
- CVEs
- CVE-2018-15859
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 01:32 UTC · Revision 1
Source evidence
Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.
osv:DEBIAN-CVE-2018-15859
libxkbcommon
Fixed versions: 0.8.2-1
libxkbcommon
Fixed versions: 0.8.2-1
libxkbcommon
Fixed versions: 0.8.2-1
x11-xkb-utils
Fixed versions: Not specified
x11-xkb-utils
Fixed versions: Not specified
x11-xkb-utils
Fixed versions: Not specified
Complete source record
{
"id": "3a0113bba1d23704eba37f106488e37a531a64777a9411d440b785d878b112e3",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2018-15859",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2018-15859",
"summary": "Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.",
"evidence": "osv:DEBIAN-CVE-2018-15859",
"products": [
{
"name": {
"value": "libxkbcommon",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.2-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxkbcommon",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.2-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxkbcommon",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.2-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "x11-xkb-utils",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.7+7",
"evidence": "/affected/3/versions"
},
{
"value": "7.7+8",
"evidence": "/affected/3/versions"
},
{
"value": "7.7+9",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "x11-xkb-utils",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.7+9",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "x11-xkb-utils",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.7+9",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2018-15859",
"aliases": [
"DEBIAN-CVE-2018-15859"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.2-1"
}
]
}
],
"package": {
"name": "libxkbcommon",
"purl": "pkg:deb/debian/libxkbcommon?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.2-1"
}
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}
],
"package": {
"name": "libxkbcommon",
"purl": "pkg:deb/debian/libxkbcommon?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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{
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}
]
}
],
"package": {
"name": "libxkbcommon",
"purl": "pkg:deb/debian/libxkbcommon?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
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],
"package": {
"name": "x11-xkb-utils",
"purl": "pkg:deb/debian/x11-xkb-utils?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"7.7+7",
"7.7+8",
"7.7+9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11-xkb-utils",
"purl": "pkg:deb/debian/x11-xkb-utils?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"7.7+9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "x11-xkb-utils",
"purl": "pkg:deb/debian/x11-xkb-utils?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"7.7+9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-15859.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-23T18:04:46.888039497Z",
"provider": "osv",
"upstream": [
"CVE-2018-15859"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2018-15859"
]
},
"related_cves": [
{
"value": "CVE-2018-15859",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 423722,
"published_at": "2018-08-25T21:29:02.17+00:00"
}