UBUNTU-CVE-2026-33721

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Source
https://ubuntu.com/security/CVE-2026-33721
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33721
Upstream
Published
2026-03-27T01:16:00Z
Modified
2026-05-20T16:25:31Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

MapServer is a system for developing web-based GIS applications. Starting in version 4.2 and prior to version 8.6.1, a heap-buffer-overflow write in MapServer’s SLD (Styled Layer Descriptor) parser lets a remote, unauthenticated attacker crash the MapServer process by sending a crafted SLD with more than 100 Threshold elements inside a ColorMap/Categorize structure (commonly reachable via WMS GetMap with SLD_BODY). Version 8.6.1 patches the issue.

References

Affected packages

Ubuntu:16.04:LTS
mapserver

Package

Name
mapserver
Purl
pkg:deb/ubuntu/mapserver?arch=source&distro=xenial

Affected ranges

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

Affected versions

7.*
7.0.0-4build1
7.0.0-5ubuntu1
7.0.0-7
7.0.0-8
7.0.0-8build1
7.0.0-9
7.0.0-9ubuntu1
7.0.0-9ubuntu2
7.0.0-9ubuntu3
7.0.0-9ubuntu3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "libmapserver2",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "python-mapscript",
            "binary_version": "7.0.0-9ubuntu3.1"
        },
        {
            "binary_name": "ruby-mapscript",
            "binary_version": "7.0.0-9ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:18.04:LTS
mapserver

Package

Name
mapserver
Purl
pkg:deb/ubuntu/mapserver?arch=source&distro=bionic

Affected ranges

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

Affected versions

7.*
7.0.6-2build1
7.0.7-1
7.0.7-1build1
7.0.7-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "libmapserver2",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "python-mapscript",
            "binary_version": "7.0.7-1build2"
        },
        {
            "binary_name": "ruby-mapscript",
            "binary_version": "7.0.7-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:20.04:LTS
mapserver

Package

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

Affected ranges

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

Affected versions

7.*
7.4.1-1build1
7.4.1-1build3
7.4.2-1
7.4.2-1build1
7.4.3-1
7.4.3-1build2
7.4.3-2
7.4.3-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "libmapserver2",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "php-mapscript",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "php-mapscript-ng",
            "binary_version": "7.4.3-2build1"
        },
        {
            "binary_name": "python3-mapscript",
            "binary_version": "7.4.3-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:22.04:LTS
mapserver

Package

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

Affected ranges

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

Affected versions

7.*
7.6.3-1~exp1ubuntu1
7.6.4-2
7.6.4-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "7.6.4-2build2"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "7.6.4-2build2"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "7.6.4-2build2"
        },
        {
            "binary_name": "libmapserver2",
            "binary_version": "7.6.4-2build2"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "7.6.4-2build2"
        },
        {
            "binary_name": "python3-mapscript",
            "binary_version": "7.6.4-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:24.04:LTS
mapserver

Package

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

Affected ranges

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

Affected versions

8.*
8.0.1-2build1
8.0.1-2build2
8.0.1-2build3
8.0.1-2build5
8.0.1-4ubuntu1
8.0.1-4ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "libmapserver2t64",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "php-mapscript-ng",
            "binary_version": "8.0.1-4ubuntu2"
        },
        {
            "binary_name": "python3-mapscript",
            "binary_version": "8.0.1-4ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:25.10
mapserver

Package

Name
mapserver
Purl
pkg:deb/ubuntu/mapserver?arch=source&distro=questing

Affected ranges

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

Affected versions

8.*
8.4.0-1build1
8.4.0-4
8.4.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "libmapserver2t64",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "php-mapscript-ng",
            "binary_version": "8.4.0-4build1"
        },
        {
            "binary_name": "python3-mapscript",
            "binary_version": "8.4.0-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"
Ubuntu:26.04:LTS
mapserver

Package

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

Affected ranges

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

Affected versions

8.*
8.4.0-4build1
8.4.1-1
8.4.1-1build1
8.4.1-2
8.4.1-2build1
8.6.0-1
8.6.0-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cgi-mapserver",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "libmapscript-java",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "libmapscript-perl",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "libmapserver2t64",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "mapserver-bin",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "php-mapscript-ng",
            "binary_version": "8.6.0-1build1"
        },
        {
            "binary_name": "python3-mapscript",
            "binary_version": "8.6.0-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33721.json"