UnratedFix available
libxtst vulnerabilities
Type: advisorySources: OSV
It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to access memory out of bounds, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7951) Tobias Stoeckmann discovered that libXtst did not properly handle certain replies from the X server. A malicious X server could possibly use this issue to cause libXtst to enter an infinite loop, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7952)
- 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-2016-7951, CVE-2016-7952, CVE-2026-94286
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:03 UTC · Revision 1
Source evidence
It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to access memory out of bounds, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7951) Tobias Stoeckmann discovered that libXtst did not properly handle certain replies from the X server. A malicious X server could possibly use this issue to cause libXtst to enter an infinite loop, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7952)
osv:USN-8939-1
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": "a7983c62df9af98cd62e19168edb13f0194fa780fd2b09e6b1be0e5e4a5fa284",
"url": "https://osv.dev/vulnerability/USN-8939-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "libxtst vulnerabilities",
"summary": "It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to access memory out of bounds, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7951) Tobias Stoeckmann discovered that libXtst did not properly handle certain replies from the X server. A malicious X server could possibly use this issue to cause libXtst to enter an infinite loop, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7952)",
"evidence": "osv:USN-8939-1",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
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{
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{
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"evidence": "/affected/3/versions"
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},
{
"name": {
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},
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{
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{
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},
{
"name": {
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{
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],
"affected_versions": [
{
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{
"value": "2:1.2.5-1build1",
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}
]
}
],
"severity": "unknown",
"structured": {
"id": "USN-8939-1",
"aliases": [
"USN-8939-1"
],
"affected": [
{
"ranges": [
{
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"events": [
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{
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],
"package": {
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"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra-legacy%2Fxenial",
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},
"versions": [
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]
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},
{
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}
]
},
{
"id": "CVE-2026-94286",
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{
"type": "CVSS_V3",
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},
{
"type": "Ubuntu",
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}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"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",
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},
{
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}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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}
]
}
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
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],
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}
},
{
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}
]
}
],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
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],
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},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"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": {
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"cves_map": {
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{
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{
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},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.3-1ubuntu0.22.04.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
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{
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{
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],
"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"
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},
{
"type": "Ubuntu",
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]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
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],
"availability": "No subscription required"
}
},
{
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{
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{
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{
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],
"package": {
"name": "libxtst",
"purl": "pkg:deb/ubuntu/libxtst?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
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},
{
"type": "Ubuntu",
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]
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],
"ecosystem": "Ubuntu:26.10"
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},
"ecosystem_specific": {
"binaries": [
{
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}
],
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}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
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]
}
],
"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"
],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json",
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{
"id": "CVE-2026-94286",
"severity": [
{
"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"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxtst6",
"binary_version": "2:1.2.5-1ubuntu0.1"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-20T17:02:24.967861182Z",
"provider": "osv",
"upstream": [
"CVE-2016-7951",
"CVE-2016-7952",
"CVE-2026-94286",
"UBUNTU-CVE-2016-7951",
"UBUNTU-CVE-2016-7952",
"UBUNTU-CVE-2026-94286"
],
"references": [
"https://ubuntu.com/security/notices/USN-8939-1",
"https://ubuntu.com/security/CVE-2016-7951",
"https://ubuntu.com/security/CVE-2016-7952",
"https://ubuntu.com/security/CVE-2026-94286"
]
},
"related_cves": [
{
"value": "CVE-2016-7951",
"evidence": "/upstream"
},
{
"value": "CVE-2016-7952",
"evidence": "/upstream"
},
{
"value": "CVE-2026-94286",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 389773,
"published_at": "2026-10-19T17:17:18+00:00"
}