USN-8939-1

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/notices/USN-8939-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8939-1
Upstream
CVE (3)
Related
UBUNTU (3)
Published
2026-10-19T17:17:18Z
Modified
2026-10-20T17:02:24Z
Summary
libxtst vulnerabilities
Details

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)

References

Affected packages

Ubuntu:22.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.3-1ubuntu0.22.04.1

Affected versions

2:1.*
2:1.2.3-1build2
2:1.2.3-1build3
2:1.2.3-1build4

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.3-1ubuntu0.22.04.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:24.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.3-1.1ubuntu0.1

Affected versions

2:1.*
2:1.2.3-1.1
2:1.2.3-1.1build1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.3-1.1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:26.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.5-1ubuntu0.1

Affected versions

2:1.*
2:1.2.5-1
2:1.2.5-1build1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.5-1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:26.10
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.5-1ubuntu1

Affected versions

2:1.*
2:1.2.5-1build1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.5-1ubuntu1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.10"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:Pro:16.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.2-1ubuntu0.1~esm1

Affected versions

2:1.*
2:1.2.2-1

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.2-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2016-7951",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2016-7952",
            "severity":  [
                {
                    "score":  "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:Pro:18.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.3-1ubuntu0.18.04.1~esm1

Affected versions

2:1.*
2:1.2.3-1

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.3-1ubuntu0.18.04.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"
Ubuntu:Pro:20.04:LTS
libxtst

Package

Name
libxtst
Purl
pkg:deb/ubuntu/libxtst?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.2.3-1ubuntu0.20.04.1~esm1

Affected versions

2:1.*
2:1.2.3-1

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxtst6",
            "binary_version":  "2:1.2.3-1ubuntu0.20.04.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-94286",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8939-1.json"