USN-8913-1

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Source
https://ubuntu.com/security/notices/USN-8913-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8913-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8913-1
Upstream
CVE (4)
Related
UBUNTU (4)
Published
2026-10-12T12:53:41Z
Modified
2026-10-12T20:28:09Z
Summary
libx11 vulnerabilities
Details

Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-88806)

It was discovered that libx11 incorrectly handled certain X Input Method (XIM) messages. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use these issues to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94283, CVE-2026-94284)

It was discovered that libx11 incorrectly handled converting certain multibyte text. An attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94285)

References

Affected packages

Ubuntu:22.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.7.5-1ubuntu0.4

Affected versions

2:1.*
2:1.7.2-1
2:1.7.2-2
2:1.7.2-2build1
2:1.7.5-1
2:1.7.5-1ubuntu0.2
2:1.7.5-1ubuntu0.3

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.7.5-1ubuntu0.4"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.7.5-1ubuntu0.4"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.7.5-1ubuntu0.4"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"
Ubuntu:24.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.8.7-1ubuntu0.1

Affected versions

2:1.*
2:1.8.6-1ubuntu1
2:1.8.7-1
2:1.8.7-1build1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.8.7-1ubuntu0.1"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.8.7-1ubuntu0.1"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.8.7-1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"
Ubuntu:26.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.8.13-1ubuntu0.1

Affected versions

2:1.*
2:1.8.12-1build1
2:1.8.12-1build2
2:1.8.13-1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.8.13-1ubuntu0.1"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.8.13-1ubuntu0.1"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.8.13-1ubuntu0.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"
Ubuntu:Pro:14.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.6.2-1ubuntu2.1+esm6

Affected versions

2:1.*
2:1.6.1-1ubuntu1
2:1.6.1-1ubuntu2
2:1.6.2-1ubuntu1
2:1.6.2-1ubuntu2
2:1.6.2-1ubuntu2.1
2:1.6.2-1ubuntu2.1+esm1
2:1.6.2-1ubuntu2.1+esm2
2:1.6.2-1ubuntu2.1+esm3
2:1.6.2-1ubuntu2.1+esm4
2:1.6.2-1ubuntu2.1+esm5

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm6"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm6"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm6"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:14.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8913-1.json"
Ubuntu:Pro:16.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.6.3-1ubuntu2.2+esm5

Affected versions

2:1.*
2:1.6.3-1ubuntu2
2:1.6.3-1ubuntu2.1
2:1.6.3-1ubuntu2.2
2:1.6.3-1ubuntu2.2+esm1
2:1.6.3-1ubuntu2.2+esm2
2:1.6.3-1ubuntu2.2+esm3
2:1.6.3-1ubuntu2.2+esm4

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm5"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm5"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm5"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"
Ubuntu:Pro:18.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.6.4-3ubuntu0.4+esm3

Affected versions

2:1.*
2:1.6.4-3
2:1.6.4-3ubuntu0.1
2:1.6.4-3ubuntu0.2
2:1.6.4-3ubuntu0.3
2:1.6.4-3ubuntu0.4
2:1.6.4-3ubuntu0.4+esm1
2:1.6.4-3ubuntu0.4+esm2

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm3"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm3"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"
Ubuntu:Pro:20.04:LTS
libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:1.6.9-2ubuntu1.6+esm1

Affected versions

2:1.*
2:1.6.8-1
2:1.6.9-2
2:1.6.9-2ubuntu1
2:1.6.9-2ubuntu1.1
2:1.6.9-2ubuntu1.2
2:1.6.9-2ubuntu1.5
2:1.6.9-2ubuntu1.6

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.9-2ubuntu1.6+esm1"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.9-2ubuntu1.6+esm1"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.9-2ubuntu1.6+esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-88806",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94283",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94284",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-94285",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "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-8913-1.json"