UBUNTU-CVE-2026-40687

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Source

https://ubuntu.com/security/CVE-2026-40687

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json

JSON Data

https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-40687

Upstream

CVE-2026-40687

Downstream

USN-8228-1

USN-8382-1

Related

Published

2026-04-29T12:00:00Z

Modified

2026-06-04T02:14:09.088485163Z

Severity

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

Summary

[none]

Details

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.

References

Affected packages

Ubuntu:22.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.95-4ubuntu2.7

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

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.95-4ubuntu2.7",
            "binary_name": "exim4"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.95-4ubuntu2.7"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.95-4ubuntu2.7"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.95-4ubuntu2.7"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.95-4ubuntu2.7"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.95-4ubuntu2.7"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:24.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.97-4ubuntu4.4

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

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.97-4ubuntu4.4",
            "binary_name": "exim4"
        },
        {
            "binary_version": "4.97-4ubuntu4.4",
            "binary_name": "exim4-base"
        },
        {
            "binary_version": "4.97-4ubuntu4.4",
            "binary_name": "exim4-config"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.97-4ubuntu4.4"
        },
        {
            "binary_version": "4.97-4ubuntu4.4",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.97-4ubuntu4.4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:25.10

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.98.2-1ubuntu2.1

Affected versions

4.*

4.98.1-1ubuntu2

4.98.2-1ubuntu1

4.98.2-1ubuntu2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.98.2-1ubuntu2.1"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.98.2-1ubuntu2.1"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.1",
            "binary_name": "exim4-config"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.98.2-1ubuntu2.1"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.98.2-1ubuntu2.1"
        },
        {
            "binary_version": "4.98.2-1ubuntu2.1",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:26.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.99.1-1ubuntu1.1

Affected versions

4.*

4.98.2-1ubuntu2

4.99-4ubuntu1

4.99.1-1ubuntu1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.99.1-1ubuntu1.1"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.1",
            "binary_name": "exim4-base"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.99.1-1ubuntu1.1"
        },
        {
            "binary_version": "4.99.1-1ubuntu1.1",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.99.1-1ubuntu1.1"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.99.1-1ubuntu1.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:Pro:14.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.80-7ubuntu3

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

4.82-3ubuntu2.4+esm9

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
            "binary_name": "eximon4",
            "binary_version": "4.82-3ubuntu2.4+esm9"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:Pro:16.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Fxenial

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

4.86.2-2ubuntu2.6+esm9

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm9",
            "binary_name": "exim4-base"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-daemon-heavy",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
            "binary_version": "4.86.2-2ubuntu2.6+esm9",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:Pro:18.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Fbionic

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

4.90.1-1ubuntu1.10+esm6

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm6",
            "binary_name": "exim4"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm6",
            "binary_name": "exim4-config"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm6",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_name": "exim4-daemon-light",
            "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
            "binary_version": "4.90.1-1ubuntu1.10+esm6",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"

Ubuntu:Pro:20.04:LTS

exim4

Package

Name: exim4
Purl: pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.93-13ubuntu1.12+esm1

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

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "exim4",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-base",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_name": "exim4-config",
            "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
            "binary_version": "4.93-13ubuntu1.12+esm1",
            "binary_name": "exim4-daemon-heavy"
        },
        {
            "binary_version": "4.93-13ubuntu1.12+esm1",
            "binary_name": "exim4-daemon-light"
        },
        {
            "binary_version": "4.93-13ubuntu1.12+esm1",
            "binary_name": "eximon4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40687.json"