UBUNTU-CVE-2026-18103

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Source

https://ubuntu.com/security/CVE-2026-18103

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18103

Upstream

CVE-2026-18103

Published

2026-08-13T00:00:00Z

Modified

2026-08-13T19:30:26.574821584Z

Severity

4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

(A flaw was found in dhcp-server. A remote attacker with network access ...)

References

Affected packages

Ubuntu:18.04:LTS

isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.3.5-3ubuntu2

4.3.5-3ubuntu3

4.3.5-3ubuntu4

4.3.5-3ubuntu5

4.3.5-3ubuntu6

4.3.5-3ubuntu7

4.3.5-3ubuntu7.1

4.3.5-3ubuntu7.2

4.3.5-3ubuntu7.3

4.3.5-3ubuntu7.4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.4",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:20.04:LTS

isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.1-2ubuntu5

4.4.1-2ubuntu6

4.4.1-2.1ubuntu1

4.4.1-2.1ubuntu2

4.4.1-2.1ubuntu3

4.4.1-2.1ubuntu4

4.4.1-2.1ubuntu5

4.4.1-2.1ubuntu5.20.04.1

4.4.1-2.1ubuntu5.20.04.2

4.4.1-2.1ubuntu5.20.04.3

4.4.1-2.1ubuntu5.20.04.4

4.4.1-2.1ubuntu5.20.04.5

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.5",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:22.04:LTS

isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.1-2.3ubuntu1

4.4.1-2.3ubuntu2

4.4.1-2.3ubuntu2.1

4.4.1-2.3ubuntu2.2

4.4.1-2.3ubuntu2.3

4.4.1-2.3ubuntu2.4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.4.1-2.3ubuntu2.4",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:24.04:LTS

isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.3-P1-2ubuntu5

4.4.3-P1-4ubuntu1

4.4.3-P1-4ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-keama"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:26.04:LTS

isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.3-P1-4ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-keama"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.4.3-P1-4ubuntu2",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:Pro:14.04:LTS

isc-dhcp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.2.4-7ubuntu8

4.2.4-7ubuntu9

4.2.4-7ubuntu10

4.2.4-7ubuntu11

4.2.4-7ubuntu12

4.2.4-7ubuntu12.1

4.2.4-7ubuntu12.2

4.2.4-7ubuntu12.3

4.2.4-7ubuntu12.4

4.2.4-7ubuntu12.5

4.2.4-7ubuntu12.6

4.2.4-7ubuntu12.7

4.2.4-7ubuntu12.8

4.2.4-7ubuntu12.9

4.2.4-7ubuntu12.10

4.2.4-7ubuntu12.12

4.2.4-7ubuntu12.13

4.2.4-7ubuntu12.13+esm1

4.2.4-7ubuntu12.13+esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-client-noddns"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm2",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"

Ubuntu:Pro:16.04:LTS

isc-dhcp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.3.1-5ubuntu3

4.3.1-5ubuntu4

4.3.1-5ubuntu5

4.3.3-5ubuntu1

4.3.3-5ubuntu2

4.3.3-5ubuntu4

4.3.3-5ubuntu5

4.3.3-5ubuntu7

4.3.3-5ubuntu8

4.3.3-5ubuntu9

4.3.3-5ubuntu10

4.3.3-5ubuntu11

4.3.3-5ubuntu12

4.3.3-5ubuntu12.1

4.3.3-5ubuntu12.3

4.3.3-5ubuntu12.4

4.3.3-5ubuntu12.6

4.3.3-5ubuntu12.7

4.3.3-5ubuntu12.9

4.3.3-5ubuntu12.10

4.3.3-5ubuntu12.10+esm1

4.3.3-5ubuntu12.10+esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm2",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18103.json"