UBUNTU-CVE-2026-100888

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Source
https://ubuntu.com/security/CVE-2026-100888
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-100888
Upstream
  • CVE-2026-100888
Published
2026-09-28T00:16:00Z
Modified
2026-09-30T21:41:53Z
Severity
  • 7.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • 5.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

References

Affected packages

Ubuntu:16.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.10.3-3build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim10",
            "binary_version":  "2.10.3-3build1"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.10.3-3build1"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.10.3-3build1"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.10.3-3build1"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.10.3-3build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"
Ubuntu:18.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.11.0~alpha-10
2.11.0~alpha-11
2.11.0~alpha-11build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim11",
            "binary_version":  "2.11.0~alpha-11build1"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.11.0~alpha-11build1"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.11.0~alpha-11build1"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.11.0~alpha-11build1"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.11.0~alpha-11build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"
Ubuntu:20.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.11.0~alpha-12
2.11.0~alpha-13
2.11.0~alpha-14
2.11.0~beta2-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim11",
            "binary_version":  "2.11.0~beta2-1"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.11.0~beta2-1"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.11.0~beta2-1"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.11.0~beta2-1"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.11.0~beta2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"
Ubuntu:22.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.11.0~beta2-4build1
2.11.0~beta2-5
2.11.0~beta2-6

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim11",
            "binary_version":  "2.11.0~beta2-6"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.11.0~beta2-6"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.11.0~beta2-6"
        },
        {
            "binary_name":  "miltertest",
            "binary_version":  "2.11.0~beta2-6"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.11.0~beta2-6"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.11.0~beta2-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"
Ubuntu:24.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.11.0~beta2-8
2.11.0~beta2-9
2.11.0~beta2-9build3
2.11.0~beta2-9build4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim11",
            "binary_version":  "2.11.0~beta2-9build4"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.11.0~beta2-9build4"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.11.0~beta2-9build4"
        },
        {
            "binary_name":  "miltertest",
            "binary_version":  "2.11.0~beta2-9build4"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.11.0~beta2-9build4"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.11.0~beta2-9build4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"
Ubuntu:26.04:LTS
opendkim

Package

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

Affected ranges

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

Affected versions

2.*
2.11.0~beta2-9.2
2.11.0~beta2-9.2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libopendkim11",
            "binary_version":  "2.11.0~beta2-9.2build1"
        },
        {
            "binary_name":  "librbl1",
            "binary_version":  "2.11.0~beta2-9.2build1"
        },
        {
            "binary_name":  "libvbr2",
            "binary_version":  "2.11.0~beta2-9.2build1"
        },
        {
            "binary_name":  "miltertest",
            "binary_version":  "2.11.0~beta2-9.2build1"
        },
        {
            "binary_name":  "opendkim",
            "binary_version":  "2.11.0~beta2-9.2build1"
        },
        {
            "binary_name":  "opendkim-tools",
            "binary_version":  "2.11.0~beta2-9.2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100888.json"