UBUNTU-CVE-2026-40686

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Source
https://ubuntu.com/security/CVE-2026-40686
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40686
Upstream
  • CVE-2026-40686
Published
2026-04-29T12:00:00Z
Modified
2026-04-30T10:06:56.680288Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

Possible OOB read with large UTF8 trailing characters

References

Affected packages

Ubuntu:20.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.93-13ubuntu1.12?arch=source&distro=focal

Affected ranges

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

Affected versions

4.*
4.92.1-1ubuntu3
4.92.1-1ubuntu4
4.93~RC2-1ubuntu1
4.93-9ubuntu1
4.93-11ubuntu1
4.93-12ubuntu1
4.93-13ubuntu1
4.93-13ubuntu1.1
4.93-13ubuntu1.5
4.93-13ubuntu1.6
4.93-13ubuntu1.7
4.93-13ubuntu1.8
4.93-13ubuntu1.9
4.93-13ubuntu1.10
4.93-13ubuntu1.11
4.93-13ubuntu1.12

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.93-13ubuntu1.12",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:22.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.95-4ubuntu2.6?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.94.2-7ubuntu2
4.95-2ubuntu2
4.95-4ubuntu1
4.95-4ubuntu2
4.95-4ubuntu2.1
4.95-4ubuntu2.2
4.95-4ubuntu2.3
4.95-4ubuntu2.4
4.95-4ubuntu2.5
4.95-4ubuntu2.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.95-4ubuntu2.6",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:24.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.97-4ubuntu4.3?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.96-17ubuntu2
4.96-17ubuntu2.1
4.97-3ubuntu1
4.97-4ubuntu1
4.97-4ubuntu3
4.97-4ubuntu4
4.97-4ubuntu4.1
4.97-4ubuntu4.2
4.97-4ubuntu4.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.97-4ubuntu4.3",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:25.10
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.98.2-1ubuntu2?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*
4.98.1-1ubuntu2
4.98.2-1ubuntu1
4.98.2-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.98.2-1ubuntu2",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:26.04
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.99.1-1ubuntu1?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.98.2-1ubuntu2
4.99-4ubuntu1
4.99.1-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.99.1-1ubuntu1",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:Pro:14.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.82-3ubuntu2.4+esm8?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

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

Affected versions

4.*
4.80-7ubuntu3
4.80-7ubuntu4
4.80-9ubuntu1
4.80-9ubuntu2
4.82-3ubuntu1
4.82-3ubuntu2
4.82-3ubuntu2.1
4.82-3ubuntu2.2
4.82-3ubuntu2.3
4.82-3ubuntu2.4
4.82-3ubuntu2.4+esm1
4.82-3ubuntu2.4+esm2
4.82-3ubuntu2.4+esm3
4.82-3ubuntu2.4+esm4
4.82-3ubuntu2.4+esm6
4.82-3ubuntu2.4+esm7
4.82-3ubuntu2.4+esm8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.82-3ubuntu2.4+esm8",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:Pro:16.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.86.2-2ubuntu2.6+esm8?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

4.*
4.86-3ubuntu1
4.86-7ubuntu1
4.86-7ubuntu2
4.86-7ubuntu3
4.86.2-2ubuntu1
4.86.2-2ubuntu2
4.86.2-2ubuntu2.1
4.86.2-2ubuntu2.2
4.86.2-2ubuntu2.3
4.86.2-2ubuntu2.4
4.86.2-2ubuntu2.5
4.86.2-2ubuntu2.6
4.86.2-2ubuntu2.6+esm1
4.86.2-2ubuntu2.6+esm2
4.86.2-2ubuntu2.6+esm4
4.86.2-2ubuntu2.6+esm5
4.86.2-2ubuntu2.6+esm6
4.86.2-2ubuntu2.6+esm7
4.86.2-2ubuntu2.6+esm8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm8",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"
Ubuntu:Pro:18.04:LTS
exim4

Package

Name
exim4
Purl
pkg:deb/ubuntu/exim4@4.90.1-1ubuntu1.10+esm5?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

4.*
4.89-5ubuntu1
4.89-9ubuntu1
4.89-9ubuntu2
4.89-9ubuntu3
4.89-9ubuntu4
4.90.1-1ubuntu1
4.90.1-1ubuntu1.1
4.90.1-1ubuntu1.2
4.90.1-1ubuntu1.3
4.90.1-1ubuntu1.4
4.90.1-1ubuntu1.5
4.90.1-1ubuntu1.8
4.90.1-1ubuntu1.9
4.90.1-1ubuntu1.10
4.90.1-1ubuntu1.10+esm1
4.90.1-1ubuntu1.10+esm2
4.90.1-1ubuntu1.10+esm3
4.90.1-1ubuntu1.10+esm4
4.90.1-1ubuntu1.10+esm5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm5",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40686.json"