UBUNTU-CVE-2026-88806

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Source
https://ubuntu.com/security/CVE-2026-88806
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-88806
Upstream
  • CVE-2026-88806
Published
2026-09-21T14:17:00Z
Modified
2026-09-23T23:36:46Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

References

Affected packages

Ubuntu:20.04:LTS
libx11

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

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 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.9-2ubuntu1.6"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.9-2ubuntu1.6"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.9-2ubuntu1.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"
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

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 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.7.5-1ubuntu0.3"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.7.5-1ubuntu0.3"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.7.5-1ubuntu0.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.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

Affected versions

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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.8.7-1build1"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.8.7-1build1"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.8.7-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.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

Affected versions

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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.8.13-1"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.8.13-1"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.8.13-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.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

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 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm5"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm5"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.2-1ubuntu2.1+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"
Ubuntu:Pro:16.04:LTS
libx11

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

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 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm4"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm4"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.3-1ubuntu2.2+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.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

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 

{
    "binaries":  [
        {
            "binary_name":  "libx11-6",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm2"
        },
        {
            "binary_name":  "libx11-data",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm2"
        },
        {
            "binary_name":  "libx11-xcb1",
            "binary_version":  "2:1.6.4-3ubuntu0.4+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88806.json"