HighFix available
libxtst — security advisory
An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.
- Products
- libxtst
- Affected versions
- 2:1.2.2-1, 2:1.2.3-1, 2:1.2.3-1.1, 2:1.2.3-1.1build1, 2:1.2.3-1build2, 2:1.2.3-1build3, 2:1.2.3-1build4, 2:1.2.5-1, 2:1.2.5-1build1
- Fixed versions
- 2:1.2.2-1ubuntu0.1~esm1, 2:1.2.3-1.1ubuntu0.1, 2:1.2.3-1ubuntu0.18.04.1~esm1, 2:1.2.3-1ubuntu0.20.04.1~esm1, 2:1.2.3-1ubuntu0.22.04.1, 2:1.2.5-1ubuntu0.1, 2:1.2.5-1ubuntu1
- CVEs
- CVE-2026-94286
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:03 UTC · Revision 1
Source evidence
An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.
osv:UBUNTU-CVE-2026-94286
libxtst
Fixed versions: 2:1.2.2-1ubuntu0.1~esm1
libxtst
Fixed versions: 2:1.2.3-1ubuntu0.18.04.1~esm1
libxtst
Fixed versions: 2:1.2.3-1ubuntu0.20.04.1~esm1
libxtst
Fixed versions: 2:1.2.3-1ubuntu0.22.04.1
libxtst
Fixed versions: 2:1.2.3-1.1ubuntu0.1
libxtst
Fixed versions: 2:1.2.5-1ubuntu1
libxtst
Fixed versions: 2:1.2.5-1ubuntu0.1
Complete source record
{
"id": "d1611cc0030d295264adba4ba4deddc45893f1cf7605f9de630e6c6e2be94650",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-94286",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-94286",
"summary": "An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.",
"evidence": "osv:UBUNTU-CVE-2026-94286",
"products": [
{
"name": {
"value": "libxtst",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.2-1ubuntu0.1~esm1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.2-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.3-1ubuntu0.18.04.1~esm1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.3-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.3-1ubuntu0.20.04.1~esm1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.3-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.3-1ubuntu0.22.04.1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.3-1build2",
"evidence": "/affected/3/versions"
},
{
"value": "2:1.2.3-1build3",
"evidence": "/affected/3/versions"
},
{
"value": "2:1.2.3-1build4",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.3-1.1ubuntu0.1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.3-1.1",
"evidence": "/affected/4/versions"
},
{
"value": "2:1.2.3-1.1build1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.5-1ubuntu1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.5-1build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libxtst",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.2.5-1ubuntu0.1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "2:1.2.5-1",
"evidence": "/affected/6/versions"
},
{
"value": "2:1.2.5-1build1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-94286",
"aliases": [
"UBUNTU-CVE-2026-94286"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.2-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"2:1.2.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.2-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1ubuntu0.18.04.1~esm1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"2:1.2.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.3-1ubuntu0.18.04.1~esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1ubuntu0.20.04.1~esm1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"2:1.2.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.3-1ubuntu0.20.04.1~esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1ubuntu0.22.04.1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2:1.2.3-1build2",
"2:1.2.3-1build3",
"2:1.2.3-1build4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.3-1ubuntu0.22.04.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1.1ubuntu0.1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2:1.2.3-1.1",
"2:1.2.3-1.1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.3-1.1ubuntu0.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.5-1ubuntu1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2:1.2.5-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.5-1ubuntu1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.5-1ubuntu0.1"
}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2:1.2.5-1",
"2:1.2.5-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94286.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.5-1ubuntu0.1"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-20T16:50:28.833881464Z",
"provider": "osv",
"upstream": [
"CVE-2026-94286"
],
"references": [
"https://ubuntu.com/security/CVE-2026-94286",
"https://www.cve.org/CVERecord?id=CVE-2026-94286",
"https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10",
"https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10/diffs?commit_id=16023c86070e6af9407330deea3938fcef75815b",
"https://ubuntu.com/security/notices/USN-8939-1"
]
},
"related_cves": [
{
"value": "CVE-2026-94286",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 389771,
"published_at": "2026-09-28T09:17:00+00:00"
}